Mixed heating with electricity and water to save the cost of hot water during the heating period

It is nec­es­sary to start con­sid­er­ing the prob­lem of mixed heat­ing with an exist­ing heat­ing net­work. It is usu­al­ly under­stood that the house has already imple­ment­ed some method of space heat­ing based on a sin­gle-cir­cuit boil­er — gas or sol­id fuel, but this is not so impor­tant. As a spe­cial case, there is a cen­tral­ized heat­ing net­work that sup­plies heat to hous­es.

The prob­lem can be divid­ed into two areas:

  1. Sav­ing ener­gy costs with indi­vid­ual heat­ing.
  2. Reheat­ing of the coolant when the cen­tral net­work is turned off.


Advantages and disadvantages of combined water-electricity heating systems

Easily integrated into an existing system

The com­bined radi­a­tor has gained pop­u­lar­i­ty among con­sumers with its main advan­tage — the ver­sa­til­i­ty of heat trans­fer. It is able to pro­vide room heat­ing both in the case of inclu­sion in the gen­er­al heat­ing net­work, and when oper­at­ing inde­pen­dent­ly in the form of a local heat­ing device, sim­i­lar to a con­ven­tion­al oil radi­a­tor.

But it also has dis­ad­van­tages that lim­it its preva­lence in the pop­u­la­tion:

  • Dan­ger of elec­tric shock. Water, used as a con­duc­tor of ther­mal ener­gy, is for the most part an excel­lent con­duc­tor of elec­tric­i­ty. There­fore, when using water, it is nec­es­sary to pro­vide for the pro­tec­tion of a per­son. Again, this is an addi­tion­al cost.
  • Short ser­vice life of the heat­ing ele­ment. The water used in the cen­tral heat­ing net­work does not have a high degree of purifi­ca­tion and neg­a­tive­ly affects the heat­ing ele­ment, caus­ing the depo­si­tion of insol­u­ble par­ti­cles on its sur­face, there­by reduc­ing its lifes­pan. This is where the third flaw comes in.
  • The need to peri­od­i­cal­ly dis­as­sem­ble the radi­a­tor and clean it. Since the heat­ing ele­ment is locat­ed at the very bot­tom of the radi­a­tors, all the muck that is sus­pend­ed in the water of the heat­ing main is deposit­ed there.

Scope of combined radiators

A typ­i­cal scheme when com­bined heat­ing radi­a­tors water elec­tric­i­ty become rel­e­vant:

  • Branched heat­ing sys­tem. Remote sec­tions of the net­work need to be heat­ed, but at the same time, heat loss­es exceed all con­ceiv­able lim­its, and due to hydraulic resis­tance and the length of pipeline sec­tions, heat still does not get in suf­fi­cient quan­ti­ties. Local reheat­ing of the heat car­ri­er using a built-in elec­tric heat­ing ele­ment seems to be the least expen­sive option with­out sig­nif­i­cant alter­ations to exist­ing equip­ment.
  • Insta­bil­i­ty of heat sup­ply from the main source. In the case of an indi­vid­ual boil­er, this may be a sud­den­ly run­ning out of fuel, and with cen­tral­ized heat­ing, an acci­dent on the heat­ing main and the heat point. Since smooth freez­ing dur­ing the cold sea­son is hard­ly part of the plans of the inhab­i­tants, elec­tric heat­ing can serve as an excel­lent option as a tem­po­rary mea­sure.

Leak protection not included.  Take care of yourself..

Electricity consumption for heating when using combined radiators

A rather impor­tant point that wor­ries absolute­ly all peo­ple — how much will it cost to oper­ate such a sys­tem and what will be the elec­tric­i­ty con­sump­tion for heat­ing? It is dif­fi­cult to answer this ques­tion with great accu­ra­cy, so it would be bet­ter if every­one cal­cu­lates the costs on the basis of indica­tive data:

To heat a medi­um-sized room in win­ter, a 24-hour heater with a pow­er of about 0.4 kW is required. This is in the absence of any oth­er source of heat and good insu­la­tion of the room. There­fore, a month­ly con­sump­tion of 300 kWh per room is obtained.

Branched network

In the case of heat­ing the coolant to a high­er tem­per­a­ture than that enter­ing the radi­a­tor, the sit­u­a­tion is even more chaot­ic, and for the exam­ple already giv­en above, but tak­ing into account the pres­ence of anoth­er heat source, the elec­tric­i­ty con­sump­tion will be four times less.

For those who want to inde­pen­dent­ly esti­mate the costs, there is a stan­dard that states a heat ener­gy rate of 400 Mcal per room. Well, from one kilo­watt you can squeeze out about 0.8 Mcal.

An example of models from different manufacturers (advantages and disadvantages, choosing the best model)

Not all man­u­fac­tur­ers of heat engi­neer­ing devices pro­duce com­bined devices, how­ev­er, there are sev­er­al typ­i­cal rep­re­sen­ta­tives of the mid­dle and bud­get seg­ment — Ten­rad al / bm, HotEn­er­gy and oth­ers like them. They are unit­ed by the fact that these firms posi­tion all log­i­cal­ly jus­ti­fied and tech­ni­cal­ly nec­es­sary solu­tions as mega-advan­tages of their prod­ucts, which some­times caus­es mis­un­der­stand­ing.

It is best to pay atten­tion to devices with max­i­mum pro­tec­tion against leak­age, cor­ro­sion and elec­tric shock. And the design is con­sid­ered in the sec­ond place.


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