In many occasions, we have found DHW set on some dual plate Caleffi  HIUs extremely high which has resulted in high bills, build of limescale in the HIU, leaks and caused some parts to fail.

Our engineers will make sure to calibrate your CaleffiHIU to the manufacturer recommendations so that you just pay  for what you need.

The lowest is the primary return temperature the most efficient your system is. According to Besa Standards, the primary return temperature should be lower than 25°C while hot water is in use and below 40°C with heating on. The Caleffi HIU can achieve this easily if commissioned and serviced by the right company.

R&B London HIU Engineers will make sure that your Caleffi HIU is set correctly to the manufacturer recommendations and to use it in the most efficient way and  meet BESA Standards.

It’s important to make sure that your heating flow temperature and detla T are set accordingly to the type of the heating system you have.

For underfloor heating systems the heating flow temperature should be set at  45°C max. If you have heating system with radiators then  we will set it up to 60°C.

Please note that if your radiators are hot from the top and cold from the bottom it doesn’t mean they are not working properly or they need to be bled but that your radiators system is well balanced and the heating is being used to the most efficient way with a lower secondary return temperature.

As part of the annual service, our engineer will clean the strainer (filter) from debris and sludge to prevent lack of flow rate and make sure it doesn’t end up in your plate heat exchangers.