Appropriate heating of the house is a very important issue that should be considered at the stage of construction and choosing a house design. What is a heat exchanger and what role does it play in a heating installation?
How does a heat exchanger work?
A heat exchanger is a special device that allows heat to be exchanged between liquids of different temperatures. The essence here is the phenomenon of convection, i.e. energy transfer. In heating installations, a high-temperature fluid transfers its energy to a wall or tube containing a lower-temperature fluid.
The heat exchanger in any system is a special mechanical device that takes part in heat exchange. In practice, ground heat exchangers and plate heat exchangers can be distinguished, and which variant will be used depends on the design of the heating installation.
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Where are heat exchangers used?
The heat exchanger solution is used in buildings with a heat recovery system in which air masses flow between plate heat exchangers arranged in parallel. In this way, special ventilation channels are created, allowing air to flow.
Which heat exchanger is worth choosing?
The most important issue is the selection of appropriate heat exchangers that will allow the entire system to operate effectively. It is necessary to pay attention to the parameters and specificity of a given project. The best solution is to choose proven and recommended models. What proposals are worth considering?
Onnline Mega Solar bivalent exchanger with two coils
T 
o one of the valued products that was prepared to use the convection phenomenon in heating installations with two heat sources. It allows you to prepare and store domestic hot water. The product has all the necessary approvals and is covered by the manufacturer's warranty, but remember to regularly replace the magnesium anode. A big advantage is the casing, which can be easily and conveniently dismantled for transport. This model is equipped with a temperature indicator.
The Onnline Mega Solar bivalent heat exchanger is a tank with a capacity of 300 l, made of steel, with an energy class of C.
Galmet 200l SGW(S)B TOWER BIWAL bivalent exchanger with two spiral coils
SGW(S)B Tower Biwal is a free-standing heat exchanger model characterized by excellent quality and solid workmanship. Enamelled tank, 
for which insulation was made of hard polyurethane foam. The great advantage of the product is excellent anti-corrosion protection, made using wet-applied ceramic enamel. The bivalent exchanger allows you to connect up to 3 heat sources at the same time. Depending on the heating needs of the building, the exchanger is also available in other sizes: 300l, 400l, 500l, as well as 720l and 1000l.
Hot water exchanger with a spiral coil, standing SGW(S) Tower Grand 200L
Another recommended model is the standing hot water exchanger with a spiral coil, SGW(S) Tower Grand 200L. Its characteristic feature is an enlarged spiral coil, adapted to work with heat pumps. The exchanger allows you to heat and store hot water. The tank insulation is made of special, hard polyurethane foam, on which an additional, soft layer made of skay lagging is attached.
The SGW(S) Tower Grand exchanger is equipped with two magnesium anodes, which even better protects the device against corrosion. This exchanger variant is also available in the following versions: 160l with a 1.4m coil, 250l with a 2.4m coil, 300l with a 2.7m coil.
Galmet SGW(S) Maxi 250L heat pump exchanger with a 2.9 m2 spiral coil
The SGW(S) Maxi 250L heat pump exchanger with a 2.9 m2 spiral coil is also very popular. Designed in such a way as to make perfect use of the possibilities offered by heating based on a heat pump. Tank insulation made with polyurethane foam. Its high density allows for maximum reduction of heat loss. The whole thing is covered with soft PVC foil. The product is perfectly protected against corrosion thanks to magnesium anodes, which are responsible for sealing micro-cracks. The whole thing is preserved with ceramic enamel.
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