Safety heat exchangers

WATERWAY Engineering GmbH
manufactures these heat exchangers from flexible stainless steel pipes to your specification.

Should a defect (heating pump, valve, sensor) or a power outage due to insufficient heat output lead to boiler overheating, steam formation would cause a rise in system pressure and potentially a (steam) explosion (therefore, a safety valve should also be installed in the system!). To prevent this dangerous situation (maximum boiler temperature 110°C according to EN303-5), a safety heat exchanger is often installed in biomass boilers to dissipate energy generated in the boiler (fuel) or stored in the combustion system (cast iron grate, firebricks). As soon as this critical temperature is reached, cold water flows through the safety heat exchanger installed in the boiler via a power-independent valve (in our case, a capillary tube sensor) and is cooled until this critical temperature is no longer exceeded.

Sometimes, depending on the boiler design, other configurations (bypass lines) are used, but in smaller boiler applications, SIWTs (siphonic heat exchangers) have become established due to their simple installation and compact size. The function, dimensions, and position of the SIWT are therefore always specific to the boiler and are always checked during type approval testing. Therefore, the heat exchanger's performance is not always the decisive factor!