Craving for warmth

Schemat­ic dia­gram of a gas con­vec­tor with forced air and flue gas removal. The installed fan heater speeds up the process of heat exchange and reduces the warm-up time of the room
Scheme of the Gazelle Tech­no Pre­mix con­vec­tor from FONDITAL with a com­plete pre­mix burn­er and a sys­tem for main­tain­ing a con­stant air / gas ratio
Gazelle Tech­no heaters from FONDITAL have a side air humid­i­fi­er…
Pip­ing is car­ried out only out­side the house accord­ing to the project
The gas pipeline is fas­tened with clamps with a rub­ber gas­ket
Wind­screen at the end of the flue
Econ­o­my class con­vec­tor of the Emax GWH series from ELEKTHERMAX
If prop­er­ly installed, the con­den­sate that forms at the end of the flue will drain to the ground.
A shut-off valve is installed at the “inlet” in front of each device.
Option to con­nect the device to the gas line. View with dec­o­ra­tive cov­er removed
Scheme of burn­er oper­a­tion with full pre­mix­ing

Gas instan­ta­neous water heaters and boil­ers, elec­tric con­vec­tors and water heat­ing radi­a­tors- all this equip­ment, well known to any­one who has ever faced the prob­lem of pro­vid­ing heat to their coun­try house. Now devices have appeared on the mar­ket that, accord­ing to the prin­ci­ple of oper­a­tion, resem­ble a tra­di­tion­al gas water heater. But they do not heat the water, but the air in the room itself. We are talk­ing about gas con­vec­tors.

Closed combustion cycle

If gas con­vec­tors have been wide­ly used for many years in the coun­tries of the USA and Europe (includ­ing Scan­di­navia), then for Europe this is a rel­a­tive­ly new, still unfa­mil­iar type of equip­ment. How­ev­er, the num­ber of prod­ucts of dif­fer­ent brands import­ed to our mar­ket is increas­ing year by year. So the prob­lem of choice is quite solv­able (if it exists at all). Now in spe­cial­ized stores you can buy heat­ing gas appli­ances man­u­fac­tured by FASER (Poland), ELEKTHERMAX, FEG KONVEKTOR (Hun­gary), FONDITAL, FRACCARO, ROBUR (Italy), BAXI GROUP (Great Britain) andetc. In Europe, sim­i­lar equip­ment is man­u­fac­tured by the KONVEKTOR plant (Europe).Uzh­gorod).

Such prod­ucts are opti­mal in terms of price-qual­i­ty ratio among oper­a­tional heat­ing devices, that is, used, for exam­ple, in coun­try hous­es with a non-per­ma­nent mode of res­i­dence. If you need heat in the work­shop, sauna, util­i­ty room, gas con­vec­tors- one of the most effi­cient ways of gen­er­at­ing heat, since it does not require the instal­la­tion of a boil­er, cir­cu­la­tion pumps, pip­ing, ris­ers and oth­er expen­sive com­po­nents of the cen­tral heat­ing sys­tem. More­over, you can turn on the con­vec­tor exact­ly at the time when you need it.- in the off-sea­son, in ear­ly spring or autumn and, of course, in cool rainy sum­mers.

This appli­ance pro­vides space heat­ing by means of hot air con­vec­tion. Accord­ing to its basic struc­ture, it is quite sim­ple: it con­sists of a dec­o­ra­tive remov­able cas­ing in which the heat exchang­er is locat­ed. This is where com­bus­tion of the incom­ing gas takes place. Heat is trans­ferred from the out­er sur­face of the heat exchang­er to the cir­cu­lat­ing room air. The device itself is mount­ed on the wall accord­ing to the attached tem­plate. The cas­ing is remov­able, which facil­i­tates the main­te­nance of the device and rou­tine main­te­nance. The mate­r­i­al from which the heat exchang­er is made can be dif­fer­ent: for FASER and ELEKTHERMAX it is sheet steel coat­ed with heat-resis­tant enam­el paint; at ROBUR and FONDITAL- Alu­mini­um alloy; at BAXI- cast iron.

Since the burn­er flame and the com­bus­tion cham­ber itself are com­plete­ly iso­lat­ed by the walls of the heat exchang­er and are not in direct con­tact with the air of the room in which the con­vec­tor is installed, the pos­si­bil­i­ty of burnt gas­es enter­ing the heat­ed room is com­plete­ly exclud­ed. The intake of fresh air nec­es­sary for gas com­bus­tion, and, accord­ing­ly, the removal of com­bus­tion prod­ucts is car­ried out out­side the heat­ed liv­ing space. For these pur­pos­es, a coax­i­al (coax­i­al) flue, arranged accord­ing to the “pipe in pipe” prin­ci­ple, is led out from the back pan­el of the con­vec­tor through the out­er wall of the house. Thus, flue gas­es are removed through the inner pipe, and com­bus­tion air is tak­en in through the out­er pipe. Both process­es pro­ceed due to nat­ur­al draft, which occurs due to the dif­fer­ence in the den­si­ty of the com­bus­tion prod­ucts and the cold air enter­ing the device. Since the pipes are locat­ed one inside the oth­er, already heat­ed air enters the com­bus­tion zone, which opti­mizes the for­ma­tion of the gas-air mix­ture, con­tribut­ing to a more com­plete com­bus­tion of the fuel.

The intake of air for com­bus­tion and the ejec­tion of com­bus­tion prod­ucts are also forced. ATin this case, the gas con­vec­tor is equipped with a cen­trifu­gal fan, and the air intake and exhaust ducts can have sep­a­rate pipes (such are some mod­els from ROBUR, FRACCARO, FONDITAL). FROMon the out­er side, on the wall of the build­ing, the gas duct is closed with a dec­o­ra­tive wind-pro­tec­tive grille, and as a result, the whole struc­ture pro­trudes above the plane of the facade by 50–120mm (depend­ing on mod­el).

In prin­ci­ple, the oper­a­tion of the con­vec­tor does not require a con­nec­tion to the mains: the igni­tion of the pilot burn­er is car­ried out using a piezo­elec­tric ele­ment. True, there are mod­els with elec­tron­ic igni­tion. Such devices need pow­er sup­ply (230 W — 50 Hz) and are equipped with a stan­dard “Euro plug”, but about them- below.

Since the con­vec­tor heat exchang­er has a devel­oped finning, the whole struc­ture is char­ac­ter­ized by low ther­mal iner­tia and pro­vides rel­a­tive­ly fast heat­ing of the air in the room. This, by the way, is espe­cial­ly con­ve­nient for inter­mit­tent oper­a­tion, if you need con­vec­tors as a heat source, for exam­ple, only on week­ends in the coun­try.

The pow­er lev­el of the device can be adjust­ed, depend­ing on the mod­el, in steps or smooth­ly. BUTfor main­tain­ing the desired air tem­per­a­ture in the range from 10 to 30C answers the ther­mo­stat. ATin auto­mat­ic mode, it com­mu­ni­cates with the gas valve, which, depend­ing on the sit­u­a­tion, increas­es or decreas­es the gas sup­ply.

The main safe­ty ele­ment in con­vec­tion gas appli­ances is a sys­tem that auto­mat­i­cal­ly stops the gas sup­ply in the absence of a flame. More­over, the remains of the gas-air mix­ture are removed from the com­bus­tion cham­ber out­side, out­side the premis­es. This sys­tem includes a flame con­trol unit that gen­er­ates a sig­nal that con­trols the gas valve, start­ing or stop­ping the gas sup­ply. ATThe inex­pen­sive mod­els Emax GWH by ELEKTHERMAX, OGK‑F by FASER, the Puch FRE series by FRACCARO are usu­al­ly fit­ted with a mechan­i­cal ther­mo­cou­ple assem­bly. More expen­sive devices (Puch FRO10 series from FRACCARO, Gazelle Tech­no Pre­mix from FONDITAL, Super­cro­mo from ROBUR) are equipped with elec­tron­ic ion­iza­tion flame con­trol.

In mod­els with forced draft, for exam­ple in the con­vec­tors of the Gazelle Tech­no Con­dens­ing series from FONDITAL and Super­cro­mo from ROBUR, the out­put of com­bus­tion gas­es is also con­trolled. For these pur­pos­es, a safe­ty air pres­sure switch is pro­vid­ed in the design of the device: in the event of a fail­ure in the sup­ply of com­bus­tion air or a mal­func­tion of the air duct fan, the dif­fer­en­tial mech­a­nism of the pres­sure sen­sor clos­es the gas valve and, there­fore, stops the fuel flow to the burn­er.

In emer­gency sit­u­a­tions (dis­ap­pear­ance of the flame, dif­fi­cul­ty in ejec­tion of com­bus­tion prod­ucts, and final­ly, the absence of air flow due to the over­lap of the wind­proof cap), the automa­tion switch­es off the device, stop­ping the fuel sup­ply. The same hap­pens in the case of a drop in gas pres­sure at the inlet to the device below the max­i­mum allow­able lev­el. That’s just the min­i­mum thresh­old val­ue of gas pres­sure in the sup­ply line, at which the con­vec­tor turns off, is dif­fer­ent for dif­fer­ent man­u­fac­tur­ers. Most West­ern Euro­pean instru­ments are designed to oper­ate at an inlet pres­sure of 20 mbar. Alas, in our gas pipeline net­works, espe­cial­ly in rur­al areas, this fig­ure can vary great­ly, drop­ping to 8–10 mbar (in win­ter). There­fore, when choos­ing a heater, ask the sell­er at what min­i­mum pres­sure the con­vec­tor you have cho­sen is capa­ble of oper­at­ing. For exam­ple, for mod­els of the Brazil­ia fam­i­ly from BAXI, “work­ing capac­i­ty” is main­tained when the gas pres­sure drops to 5 mbar, for con­vec­tors from East­ern Europe (FASER, ELEKTHERMAX)- up to 12 mbar, for Ital­ian from FRACCARO- up to 18 mbar. Of course, with reduced pres­sure in the line, the pow­er of the device will be no more than 70–80% of the nom­i­nal. This cir­cum­stance must be tak­en into account when choos­ing a con­vec­tor.

When pur­chas­ing the nec­es­sary device, one should pro­ceed from the cal­cu­la­tion: 120W per 1m2 with a ceil­ing height of up to 3 m (with insuf­fi­cient ther­mal insu­la­tion of the room). For exam­ple: a device with a pow­er of 2.5 kW heats a coun­try house with an area of ​​​​about 18–20m2. You can not dis­count the num­ber of win­dows in the room, as well as what mate­ri­als the house is built from. After all, it’s one thing- a brick cot­tage, a build­ing made of aer­at­ed con­crete blocks and some­thing com­plete­ly dif­fer­ent- pan­el house build­ing.

For the oper­a­tion of the device, both net­work (methane) and bot­tled liq­ue­fied gas (propane / butane) can be used. Most mod­els are already con­fig­ured for a par­tic­u­lar type of fuel. True, if you want to switch from main fuel to gas from a cylin­der (or vice ver­sa), you sim­ply can­not con­nect anoth­er source. The fact is that each type of fuel has its own stan­dard size of noz­zles of the main and pilot burn­ers.

Make sure that the noz­zles are always set to the gas pres­sure that is avail­able in the gas pipeline con­nect­ed direct­ly to your home, or to the con­sump­tion of liq­ue­fied gas. When pow­ered from the line, noz­zles of a larg­er diam­e­ter are used for the main and pilot burn­ers than when con­nect­ing a cylin­der. Despite the fact that man­u­fac­tur­ers nec­es­sar­i­ly indi­cate fuel con­sump­tion rates when oper­at­ing their devices on mains or liq­ue­fied gas, the actu­al con­sump­tion is deter­mined by the gas pres­sure in front of the main burn­er and the adjustable noz­zle flow area.

You can reori­ent the device to anoth­er pow­er sup­ply if you addi­tion­al­ly pur­chase the appro­pri­ate set of noz­zles. Some com­pa­nies (for exam­ple, ROBUR, BAXI) pro­vide replace­ment kits for both main and liq­ue­fied gas already in the basic con­fig­u­ra­tion. Essen­tial­ly, replac­ing noz­zles is no more dif­fi­cult than swap­ping burn­ers on a gas stove. But for reli­a­bil­i­ty, it is still bet­ter to entrust this oper­a­tion to a spe­cial­ist.

If the con­vec­tor runs on liq­ue­fied fuel, it must be tak­en into account that the source of liq­ue­fied gas must be locat­ed in the imme­di­ate vicin­i­ty of the con­vec­tor, at a dis­tance of no more than 4 m.oth­er­wise, the pres­sure may not be suf­fi­cient for the heater to reach the nom­i­nal pow­er mode.

The most famil­iar place in the house, where, as a rule, equip­ment that uses gas is placed (geyser, stove or oven),It is, of course, the kitchen. Take at least an ordi­nary stove: com­bus­tion prod­ucts enter direct­ly into the room, and in this case it is impos­si­ble to do with­out arrang­ing ven­ti­la­tion ducts, hoods, trim­mings in doors or vents that would pro­vide fresh air. Approx­i­mate­ly the same mea­sures are tak­en when installing a gas boil­er, say, in a room spe­cial­ly des­ig­nat­ed for it.- boil­er room.

With con­vec­tors, the sit­u­a­tion is dif­fer­ent. Their own­ers do not have to orga­nize addi­tion­al ven­ti­la­tion in any spe­cial way, since the com­bus­tion process in the device (it is worth empha­siz­ing again!) Has a closed cycle. Usu­al­ly, a coax­i­al flue pipe and a wind pro­tec­tion grille are sup­plied with the con­vec­tor. So there is no need for res­i­dents to inhale harm­ful com­bus­tion prod­ucts and get up in the morn­ing with a headache. Let’s get straight to the point here. Quite often, con­vec­tors are con­fused with gas fire­places. BUTHere, fire­places just use the air tak­en direct­ly from the room in which they are locat­ed to main­tain com­bus­tion.

Of course, each method of heat­ing a house has its advan­tages and dis­ad­van­tages. For exam­ple, elec­tri­cal sys­tems have an increased ener­gy inten­si­ty, so that, despite the min­i­mal ini­tial costs for their arrange­ment, elec­tric heat­ing will cost sev­er­al times more annu­al­ly than heat from a main gas boil­er house. FROMthis point of view, the inde­pen­dence of most mod­els of con­vec­tors from the pow­er sup­ply- great advan­tage. Anoth­er advan­tage of this solu­tion- the absence of a water cir­cuit in gas appli­ances. By burn­ing gas, you imme­di­ate­ly heat the air in the room. BUTthis means that you do not need to deal with the freez­ing of pipelines and drain the coolant in antic­i­pa­tion of win­ter frosts, if the house is inhab­it­ed peri­od­i­cal­ly. No sur­pris­es sim­ply can arise: there is no coolant- there is no prob­lem of its freez­ing, and the prob­a­bil­i­ty of dam­age to the heat­ing sys­tem is reduced to zero. In addi­tion, the gas heat­ing sys­tem allows you to raise the tem­per­a­ture in the room to a com­fort­able lev­el (25–30FROM). How­ev­er, an attempt to heat the house in win­ter by installing sev­er­al devices in the rooms that run on bot­tled gas is doomed to fail­ure: at sub-zero tem­per­a­tures, liq­ue­fied gas has poor volatil­i­ty, and com­bus­tion effi­cien­cy drops sharply. ToIn addi­tion, not every home­own­er will decide to lay gas pipes along the facade (indoor wiring is strict­ly pro­hib­it­ed by both GOSTs and SNiPs) and make holes in the walls near each con­vec­tor. If your house is made accord­ing to the author’s project, and a lot of mon­ey and expen­sive mate­ri­als were spent on fin­ish­ing the facade, most like­ly you will begin to equip a tra­di­tion­al heat­ing sys­tem.

And we have gas in the apartment …

All gas con­vec­tors on the Euro­pean mar­ket today are quite def­i­nite­ly divid­ed into two large groups, depend­ing on the price and the com­bi­na­tion of con­sumer char­ac­ter­is­tics.

The fam­i­lies of heaters of the series Emax GWH from ELEKTHERMAX, OGK‑F from FASER, Brazil­ia from BAXI, TS 2000 from ROBUR, as well as Uzh­gorod con­vec­tors “AKOG” can be clas­si­fied as econ­o­my class mod­els. The cost of prod­ucts varies from $230 to $400, pow­er rat­ing range- from 1.5 to 6 kW. Devices of this class are quite sim­ple in design, since the basic equip­ment main­ly pro­vides for mechan­i­cal con­trol and pro­tec­tion units. The flame is con­trolled by a ther­mo­cou­ple and the pilot burn­er is ignit­ed by means of a piezo igni­tion. There­fore, the devices are com­plete­ly autonomous, absolute­ly not need­ing to be con­nect­ed to the mains. Such, for exam­ple, is the OGK‑F series of con­vec­tors, which includes 4 mod­i­fi­ca­tions with pow­er from 1.8 to 5 kW. The devices are equipped with burn­ers from the Ital­ian WORGAS and pro­tec­tive auto­mat­ics from JUNKERS (Ger­many). The Hun­gar­i­an com­pa­ny ELEKTHERMAX pro­duces its own burn­ers for its heaters, and the pro­tec­tion unit (gas valve) is installed by the Ital­ian com­pa­ny SIT. ATThe Emax GWH series has 4 mod­els of dif­fer­ent pow­er rang­ing from 2.5 to 5.8 kW.

A wide range of con­vec­tors with pow­er from 1.5 to 2.3 kW is pre­sent­ed in the Brazil­ia F5 and F5S series of econ­o­my class mod­els from BAXI GROUP. The Eng­lish firm focus­es on well-thought-out design. ATin par­tic­u­lar, the front pan­els have dif­fer­ent col­ors (straw or grey-blue); the grille, locat­ed in the upper part of the body, is made of chrome. More­over, you can choose a mod­el with side pan­els styl­ized as oak or mahogany. A heater in this design will not spoil even a sophis­ti­cat­ed inte­ri­or.

In price cat­e­go­ry $400–800 presents more com­plex equip­ment with elec­tron­ic con­trol units, devices for main­tain­ing room humid­i­ty and a forced air cir­cu­la­tion sys­tem. You can find con­vec­tors “armed” quite seri­ous­ly: pres­sur­ized burn­ers with full pre-mix­ing of gas and air, elec­tron­ic igni­tion, ion­iza­tion con­trol of the pres­ence of a flame, etc. Mod­els with elec­tron­ic igni­tion, by the way, are more eco­nom­i­cal, since there is no need for an igni­tion burn­er with a con­stant­ly burn­ing pilot flame.

On our mar­ket, prod­ucts of this class are rep­re­sent­ed by prod­ucts from FRACCARO, FONDITAL, ROBUR. ATThe pro­gram of dif­fer­ent man­u­fac­tur­ers includes mod­els with pow­er rat­ings up to 7–8 kW. Now FONDITAL con­vec­tors with a capac­i­ty of 2.5 kW (mod­els 2200, 2200VT and 2200VT E), as well as 3, 5 and 7 kW (Pre­mix and Clas­sic) are on sale. ATROBUR’s Super­Cro­mo range includes 8 posi­tions, start­ing from the SC 3001 con­vec­tor (2.3 kW) and end­ing with the SC 8002 mod­el with a pow­er of 7 kW. The Frev fam­i­ly from FRACCARO com­bines 5 mod­els, and if the “younger” has a pow­er of 2.5 kW, then the “old­er”- 8.2 kW.

Equip­ment of the high­est price cat­e­go­ry is expen­sive enough to be used in a small coun­try house, but is quite accept­able as the main heat­ing sys­tem in coun­try cot­tages with a per­ma­nent res­i­dence regime. The whole ques­tion is, on the mod­el with what equip­ment to choose. After all, com­fort, effi­cien­cy and ease of con­trol of the device dur­ing oper­a­tion (and the ser­vice life of con­vec­tors- at least 10–15 years)The cir­cum­stances them­selves are impor­tant. Tofor exam­ple, the Puch FRO10 (FRACCARO) con­vec­tor with a pow­er of 4 kW and a cost of $The 650 can be pro­grammed with a built-in timer to turn on or off depend­ing on the time of day. ATThe stan­dard equip­ment of the heater includes a dou­ble sole­noid valve with a gas pres­sure reg­u­la­tor, an igni­tion elec­trode, an ion­iza­tion flame con­trol, an elec­tron­ic room ther­mo­stat and even a fil­ter to sup­press radio inter­fer­ence. The design is also com­ple­ment­ed by two fans- cen­trifu­gal (works on the forced removal of com­bus­tion prod­ucts) and tan­gen­tial. The lat­ter has an elec­tron­ic reg­u­la­tor and pro­vides forced cir­cu­la­tion of air mass­es in the room, there­by increas­ing the speed of hot air out­let. At the same time, a 3.4 kW con­vec­tor installed in a room with an area of ​​20m2 (ceil­ing height- up to 3 m), heats the air from 0 to 20C in just 15 min.

The Gazelle Tech­no fam­i­ly of con­vec­tors from FONDITAL also has mod­els with a con­vec­tion fan heater, elec­tron­ic automa­tion and a func­tion for pro­gram­ming oper­at­ing modes. Fea­ture of some FONDITAL con­vec­tors- in auto­mat­ic con­trol of pow­er lev­els depend­ing on the heat demand of the room. By mon­i­tor­ing the tem­per­a­ture in the room, the device, at the com­mand of the micro­proces­sor, can switch from reduced pow­er (low mode) to max­i­mum pow­er (high mode) and vice ver­sa. Thus, the set tem­per­a­ture is main­tained by the con­vec­tor inde­pen­dent­ly, with­out human inter­ven­tion.

The weak­est point of all auto­mat­ic sys­tems- in need of con­nec­tion to the pow­er sup­ply net­work. AToth­er­wise the elec­tron­ics will not work. ATEuro­pean con­di­tions, when the pow­er sup­ply is often absent or inter­mit­tent, the atti­tude towards devices that need to be con­nect­ed to the elec­tri­cal net­work is ambigu­ous. How will automa­tion work dur­ing a pow­er out­age? Of course, in some mod­els, the gas sup­ply will imme­di­ate­ly stop (secu­ri­ty sys­tems pro­vide for such a sit­u­a­tion). But will it make you feel warmer? For these rea­sons, and also due to high prices, more com­plex mod­els of con­vec­tors are not yet very pop­u­lar on our mar­ket. But econ­o­my-class devices with the most sim­pli­fied con­trol sys­tem and the sim­plest automa­tion, com­plete­ly inde­pen­dent of the vagaries of the pow­er sup­ply, are in great demand.

Burn brightly…

In heaters Brazil­ia from BAXI, Emax GWH from ELEKTHERMAX, Gazelle Tech­no Clas­sic from FONDITAL and oth­ers, the process­es of fresh air enter­ing the com­bus­tion cham­ber and flue gas removal occur due to nat­ur­al draft. Such con­vec­tors are equipped with an atmos­pher­ic ejec­tor burn­er, to which a gas jet is sup­plied through a noz­zle, entrain­ing a stream of pri­ma­ry air. Thus, the gas-air mix­ture is formed imme­di­ate­ly before the “entrance” to the main gas burn­er. At the out­let of the noz­zle (already direct­ly in the burn­er zone), an addi­tion­al, or sec­ondary, por­tion of air enters the result­ing mix­ture, after which igni­tion occurs and a flame is formed. This prin­ci­ple of oper­a­tion allows the device to work sta­bly at low gas pres­sure.

The sec­ond group includes con­vec­tors, in which forced air and removal of com­bus­tion prod­ucts are pro­vid­ed thanks to the installed cen­trifu­gal fan. ATas a result, the time for the device to reach the spec­i­fied ther­mal regime is reduced. Devices of this kind are in the Gazelle Tech­no Pre­mix mod­els from FONDITAL, Super­cro­mo from ROBUR, Frev from FRACCARO.

The Gazelle Tech­no Con­dens­ing con­vec­tor from FONDITAL is equipped with a pre-mix burn­er: all the air nec­es­sary for com­bus­tion is mixed inside it, and the gas / air ratio is kept con­stant. Such a device makes it pos­si­ble to ensure the com­plete­ness of fuel com­bus­tion with a small flame length, which means that the con­vec­tor can be made more com­pact, with high effi­cien­cy. In addi­tion, due to pre-mix­ing, the amount of harm­ful sub­stances (nitro­gen oxide and diox­ide) in the exhaust of the device is reduced, which means that the envi­ron­men­tal­ly harm­ful bur­den on the envi­ron­ment is reduced.

Con­vec­tors with nat­ur­al draft, depend­ing on the rat­ed pow­er, are designed for the instal­la­tion of a coax­i­al flue of a cer­tain length (from 200mm for devices man­u­fac­tured by ELEKTHERMAX, FASER) and diam­e­ter (50–130mm). Mod­els equipped with pres­sur­iza­tion have a cer­tain advan­tage in this sense, since the diam­e­ter of the coax­i­al gas duct can be small­er (50–80mm), which means that the wind­proof ter­mi­nal will become an incon­spic­u­ous detail on the facade of the house.

There are mod­els in which the air intake and chim­ney are sep­a­rat­ed. Thus, most FONDITAL pres­sur­ized appli­ances can be installed on walls that do not com­mu­ni­cate with the out­side, using elbows and pipe exten­sions (two diam­e­ters- 35 and 60mm). You can even extend the exhaust gas chan­nel to the roof of the build­ing. The per­mis­si­ble length of flue pipes depends on the mod­el of the con­vec­tor (its pow­er), their own diam­e­ter, the num­ber of cor­ner joints through­out the entire gas flue path and is cal­cu­lat­ed for each spe­cif­ic case.

Operating cost

Let’s pick up a cal­cu­la­tor, a pen­cil and cal­cu­late the approx­i­mate cost of oper­at­ing a gas con­vec­tor run­ning on liq­ue­fied bot­tled gas, say, some­where in the world region.

Fill­ing a 50-liter cylin­der in the world region will cost about 300rub. Gas con­sump­tion dur­ing con­vec­tor oper­a­tion by 2.5kW in rat­ed pow­er mode is approx­i­mate­ly 0.2kg/h This means that a 50-liter cylin­der will pro­vide 114–125 hours of con­tin­u­ous oper­a­tion. Con­sid­er­ing that the con­vec­tor does not work con­stant­ly, but is switched on peri­od­i­cal­ly, main­tain­ing the set air tem­per­a­ture in the room, the cylin­der will last for about 20–50 days (it all depends on the out­side tem­per­a­ture). The fact that the fill­ing of cylin­ders is car­ried out not too accu­rate­ly, “by weight”, tak­ing into account the mass of con­den­sate, also makes its own adjust­ments. With per­ma­nent res­i­dence in the win­ter, the oper­a­tion of the same con­vec­tor, but using nat­ur­al main gas as fuel, costs about 370–4,5 dol­lars. ATyear (at the cur­rent tar­iff in the world region of 0.73 rub/m3). It con­sumes about 500–600m3 gas per year.

If your coun­try house has already installed, say, a dou­ble-cir­cuit gas boil­er, whose “duty” includes heat­ing water for both the heat­ing sys­tem and san­i­tary needs, then gas con­vec­tors can become an effec­tive means of heat­ing in annex­es (on a cov­ered ter­race or in attic), in util­i­ty rooms (garage, pantry, barn, etc.) or where there is a high risk of freez­ing of water heat­ing pipes.

In prin­ci­ple, the cost of 1 kW of heat from a gas con­vec­tor depends on the cost of instal­la­tion work, the price of a par­tic­u­lar mod­el of the device and the cost of pip­ing. You can cal­cu­late this indi­ca­tor in a sim­pli­fied way by divid­ing the cost of the con­vec­tor by the indi­ca­tor of its rat­ed pow­er and adding the amount spent on installing the heater itself. ATIn the case of our exam­ple, the instal­la­tion cost of one kilo­watt of heat will be about $120.

Three bold steps to warmth

When you buy a heater pow­ered by bot­tled gas, it is enough to stock up on per­mis­sion from the State Fire Super­vi­sion Ser­vice. FROMgas equip­ment on the main fuel (boil­ers, boil­ers, radi­a­tors and con­vec­tors), the sit­u­a­tion is much more com­pli­cat­ed. Be pre­pared for the fact that you will need to go through a whole series of bureau­crat­ic pro­ce­dures. Draw­ing up tech­ni­cal doc­u­men­ta­tion and its coor­di­na­tion in var­i­ous eco­nom­ic and admin­is­tra­tive instances takes time, nerves, and mon­ey. The desired warmth will become avail­able if you suc­ces­sive­ly go through the three stages list­ed below:

one. Con­tact the ter­ri­to­r­i­al gas util­i­ty that serves the area where your house is locat­ed with a writ­ten state­ment about the desire to install a gas con­vec­tor in your home. Tothe appli­ca­tion must attach doc­u­ments pro­vid­ed by the local BTI (plan-scheme of the premis­es, papers con­firm­ing your right to own the house).

2. Get tech­ni­cal con­di­tions from the gas trust, on the basis of which you will order a project that deter­mines the wiring dia­gram and the diam­e­ter of gas pipes, as well as the instal­la­tion loca­tions of con­vec­tors, etc. True, in some gas facil­i­ties you may be told that they have nev­er heard of such a device, like a con­vec­tor. ATIn this case, it makes sense to con­tact a com­pa­ny that spe­cial­izes in the sup­ply and instal­la­tion of gas equip­ment. There you can also find out the coor­di­nates of spe­cial­ized orga­ni­za­tions in which, for a fee (usu­al­ly $70–90) can under­take all the nec­es­sary design work. As a rule, the project is ready in a max­i­mum of a week.

3. The fin­ished project must be coor­di­nat­ed with your local gas util­i­ty, so you will have to go to this insti­tu­tion again. And only after the “Agreed” stamp appears on your papers, you can pro­ceed direct­ly to the instal­la­tion of all the nec­es­sary equip­ment and the gas pipeline.

The cost of instal­la­tion work varies depend­ing on the type of build­ing (wood, brick, sand­wich pan­els, etc.). The most expen­sive piece of work- mak­ing holes. For the instal­la­tion of one con­vec­tor, as they say, on a turnkey basis, you will be charged about $50–70. Not too expen­sive, giv­en that this amount includes not only the cost of direct instal­la­tion, but also the set­up and test­ing of the device itself. Togeth­er with pip­ing work, the cost of installing one heat point can reach up to $150.

The com­bus­tion process is inher­ent­ly- This is a fuel oxi­da­tion reac­tion in which chem­i­cal com­pounds are released into the atmos­phere in the form of flue gas­es, and a cer­tain amount of heat. The com­bus­tion of gas in the con­vec­tor, as a rule, occurs with an excess of atmos­pher­ic air. And as a result, the nitro­gen present in the air (it is present in the com­bus­tion zone) also forms harm­ful com­pounds.- nitric oxide and nitro­gen diox­ide. In addi­tion, the flue gas­es con­tain car­bon monox­ide and car­bon diox­ide and water vapor. ATAs a result, this turns into weak­ly acidic pol­lu­tion of the area.

The prob­lem of reduc­ing the con­tent of nitric oxide can be solved only by high-qual­i­ty mix­ing of gas and air imme­di­ate­ly before com­bus­tion. ATIf there is not enough air, car­bon monox­ide is formed as a result of incom­plete com­bus­tion. True, com­bus­tion prod­ucts do not enter the room where the heater is installed. And the air in your area will not be gassed- con­vec­tors them­selves are much “clean­er” than an ordi­nary gas stove. When prepar­ing the mate­r­i­al, we were able to obtain infor­ma­tion on the mass of harm­ful emis­sions only for con­vec­tors from FONDITAL. ATIn par­tic­u­lar, the Gazelle Tech­no Pre­mix and Con­dens­ing mod­els, in terms of the lim­it­ing con­cen­tra­tion of nitro­gen oxides in flue gas­es, are includ­ed, accord­ing to Euro­pean stan­dards, in the fifth class of devices (up to 100 mg / (kWh).

When the prod­ucts of gas com­bus­tion are cooled to the dew point, con­den­sate falls out of them. Even if the sell­ers will assure you oth­er­wise, you should not take a word. The laws of physics are the same for boil­ers and gas con­vec­tors. ATmod­els, the coax­i­al flue of which pass­es direct­ly through the wall of the house, the for­ma­tion of con­den­sate is pos­si­ble after stop­ping or turn­ing on the device (water will sim­ply drip from the chim­ney to the ground and will not fall on the facade of the house). Since the flue gas tem­per­a­ture is about 120C, no con­den­sate is formed direct­ly dur­ing the oper­a­tion of the device with short flue pipes. With long chim­neys, every­thing depends on the con­di­tions of their ther­mal insu­la­tion and cool­ing. If you pre­fer sep­a­rate gas out­lets, the pipes will have to be insu­lat­ed, as they do when deal­ing with any oth­er gas equip­ment (the same boil­ers, for exam­ple). Oth­er­wise, in extreme cold, the end of the pipe will be cov­ered with ice and there will be prob­lems with the removal of flue gas­es.

Item of expens­es Approx­i­mate cost, $
1. Equip­ment and mate­ri­als
Gas con­vec­tor for 2.5kW (pro­duced in East­ern Europe) with a set of coax­i­al pipes 250
Cylin­der (50 l) with valve 25
Reduc­er 12
Steel pipe (3/4″), 8m 6
Flex­i­ble pip­ing (50cm) 2.3
Ball valve 2.3
TOTAL by mate­ri­als 297.6
2. Instal­la­tion and com­mis­sion­ing
Instal­la­tion and con­fig­u­ra­tion of the con­vec­tor twen­ty
Instal­la­tion of gas wiring 45
Trans­porta­tion costs (up to 30 km from MKAD) ten
TOTAL instal­la­tion 75
TOTAL 372.6

The edi­tors would like to thank the com­pa­nies TEPLOIMPORT, SANI-CONSULTANT, FRAMOSS, as well as the Euro­pean rep­re­sen­ta­tive office of BAXI GROUP for their help in prepar­ing the mate­r­i­al.

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