Combined heating boiler for heating a private house

Rel­a­tive­ly recent­ly, gas-elec­tric heat­ing boil­ers appeared on the mar­ket. The equip­ment has become very pop­u­lar due to its func­tion­al­i­ty — gas and elec­tric­i­ty are used as fuel, which allows switch­ing to anoth­er in the absence of one ener­gy source.


Each sys­tem may have a dif­fer­ent device, the com­mon sim­i­lar­i­ty lies in the spac­ing of the two heaters in dif­fer­ent hous­ings with manda­to­ry ground­ing, which ensures a high lev­el of safe­ty. There are sev­er­al schemes that dif­fer in the prin­ci­ple of oper­a­tion:

  • 2 heaters oper­ate con­tin­u­ous­ly and in par­al­lel;
  • the main ele­ment is an elec­tric heater, and the gas device is con­nect­ed to increase the out­put pow­er and water tem­per­a­ture;
  • the gas burn­er is the main one, and the elec­tric heater is the sec­ondary one.

Universal cast iron boiler

Advantages and disadvantages of combined heating systems

When con­sid­er­ing the char­ac­ter­is­tics and capa­bil­i­ties of gas-elec­tric heat­ing boil­ers, the fol­low­ing num­ber of advan­tages can be dis­tin­guished:

  • high effi­cien­cy, per­for­mance can be up to 97%
  • com­pact dimen­sions sim­pli­fy the instal­la­tion process;
  • min­i­mal impact on the envi­ron­ment;
  • com­bined sys­tems are char­ac­ter­ized by low con­sump­tion of gas and elec­tric­i­ty;
  • depend­ing on the sit­u­a­tion, switch­ing from one ener­gy source to anoth­er is car­ried out auto­mat­i­cal­ly;
  • the equip­ment can be used both for space heat­ing and hot water sup­ply;
  • the cost pays off in the process of oper­a­tion.

There are also dis­ad­van­tages:

  • to con­nect elec­tric gas boil­ers of a com­bined type, a three-phase net­work will be required and, in most cas­es, coor­di­na­tion in the rel­e­vant author­i­ties;
  • lim­it­ed scope of use: coun­try hous­es and cot­tages;
  • the price is about 70% high­er when com­pared with ana­logues that run only on gas;
  • Peri­od­ic main­te­nance and pre­ven­tive inspec­tions are required.

Features of the device and principle of operation

Universal combi boiler

There are sev­er­al types of gas-elec­tric boil­ers for home heat­ing:

  1. The main heat­ing ele­ment is a gas burn­er. Equip­ment with a pow­er­ful gas burn­er can be used for heat­ing rooms with a large area. The elec­tric heater is used here for heat­ing, which allows you to over­clock the sys­tem at min­i­mal cost.
  2. The prin­ci­ple of oper­a­tion of sys­tems with a main elec­tric dri­ve is the same as that of elec­tric boil­ers. The auto­mat­ic con­nec­tion of the gas burn­er occurs when the tem­per­a­ture drops, that is, at the moment when excess volt­age is pumped onto the pow­er grid.
  3. Designs where two heaters oper­ate simul­ta­ne­ous­ly are com­plex due to the rhyth­mic inter­ac­tion of asyn­chro­nous heat­ing. The units are effi­cient and con­stant­ly pro­vide a sta­ble tem­per­a­ture with min­i­mal con­sump­tion of gas and elec­tric­i­ty.

Advice! The choice of a par­tic­u­lar boil­er design should be based on the required func­tions, area and archi­tec­tur­al fea­tures of the build­ing. In the absence of expe­ri­ence in this area, it is bet­ter to turn to pro­fes­sion­als for the draft­ing of a heat­ing sys­tem.

Types of combined boilers

Description and capabilities of double-circuit boilers

For hous­es and cot­tages locat­ed in the coun­try­side, dou­ble-cir­cuit gas-elec­tric boil­ers are ide­al due to the fol­low­ing advan­tages:

  • Less gas con­sump­tion;
  • the cost of a dou­ble-cir­cuit heat gen­er­a­tor is high­er than a sin­gle-cir­cuit one, but low­er when com­pared with the cost of equip­ment with a sin­gle cir­cuit and an inte­grat­ed boil­er;
  • there is a simul­ta­ne­ous heat­ing of hot water and the heat car­ri­er;
  • less space is required for instal­la­tion due to its com­pact size, which allows instal­la­tion in the kitchen or in the fur­nace room, but sub­ject to all norms and require­ments.

But there are also dis­ad­van­tages here:

  • the con­sump­tion of gas, elec­tric­i­ty and water must be bal­anced;
  • if the flow of hot water decreas­es with unreg­u­lat­ed gas, then the tem­per­a­ture ris­es;
  • it will be nec­es­sary to recon­fig­ure the equip­ment in case of a change in pres­sure in the water sup­ply net­work;
  • peri­od­ic main­te­nance is nec­es­sary, as with hard water, car­bon­ate deposits form quick­ly on the heat exchang­ers, which gen­er­al­ly leads to a decrease in per­for­mance or break­age;
  • when the faucet is turned on, cold water will be sup­plied for about 30 sec­onds.

Advice! It should be under­stood that all the dis­ad­van­tages of dou­ble-cir­cuit gas-elec­tric boil­ers depend on the tech­ni­cal char­ac­ter­is­tics and the man­u­fac­tur­er. When buy­ing heat­ing equip­ment, it is bet­ter to use the ser­vices of a spe­cial­ist.

What are the installation requirements?

The con­nec­tion of elec­tric gas boil­ers must be car­ried out in com­pli­ance with cer­tain norms and rules, and it is also required to fol­low the attached instruc­tions from the man­u­fac­tur­er. Depend­ing on the design, instal­la­tion can be floor or wall.

Installation of universal heating boilers

In any case, regard­less of the device, the fol­low­ing require­ments must be observed dur­ing instal­la­tion work:

  • accord­ing to fire safe­ty con­di­tions, the walls and floor of the room intend­ed for the instal­la­tion of a gas-elec­tric heat­ing boil­er must be insu­lat­ed, for exam­ple, with a sheet of met­al;
  • when work­ing, you must be guid­ed by the con­nec­tion dia­gram, which was issued by the employ­ees of the gas ser­vice;
  • when using sev­er­al sources of ther­mal ener­gy con­nect­ed in par­al­lel, each should be pro­vid­ed with a free approach;
  • the sys­tem must be con­nect­ed to a pro­tect­ed elec­tri­cal net­work (ground­ed and iso­lat­ed);
  • when installing the chim­ney, it is oblig­a­tory to observe the dis­tance from the walls, all require­ments can be found in the tech­ni­cal data sheet;
  • the cir­cu­la­tion pump is select­ed tak­ing into account the length of the engi­neer­ing net­work and the diam­e­ter of the pipes;
  • it is allowed to use only thread­ed types of con­nec­tions;
  • dou­ble-cir­cuit designs involve the use of fil­ters for water purifi­ca­tion for each cir­cuit.

Connection diagram of a gas electric boiler

Sub­ject to the rules for con­nect­ing elec­tric gas boil­ers, there will be no prob­lems with per­for­mance, effi­cien­cy, fire safe­ty, unin­ter­rupt­ed oper­a­tion, and high effi­cien­cy is also guar­an­teed.


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