The below table shows our standing losses for the Innovo/BFC range of water heaters.
Please beware that these values should not be entered into a Part L calculation such as SBEM. SBEM asks specifically for the standing losses from a hot water storage tank. A direct fired water heater is not a hot water storage tank. The standing losses from a water heater are accounted for in the BS EN 89 efficiency calculation, which is considered a seasonal efficiency, and is entered into the SBEM software. Therefore, if you enter the standing losses into the software as well, you are effectively doubling the losses (by including them in the efficiency and in the entry box) and with double losses the installation is likely to fail. If you must put details of the tank into the calculation then you should put the insulation type and thickness (Polyurethane foam, 50mm, 0.023 W/m*K).
Below is an extract from the non-domestic building services compliance guide to prove the above statement.
Standing losses for BFC and IR water heaters:
Standing Losses (kWh)
According to EN 89
Innovo Water Heaters
BFC and SGS Water Heaters - Generation 3
|BFC 28 / SGS 28||4.20|
|BFC 30 / SGS 30||4.70|
|BFC 50 / SGS 50||4.70|
|BFC 60 / SGS 60||4.70|
|BFC 80 / SGS 80||6.70|
|BFC 100 / SGS 100||6.70|
|BFC 120 / SGS 120||6.70|
Using a magnetic water softener (or any other type) shouldn’t be a problem so long as the water hardness is kept at the minimum amount, as reducing the hardness to zero could do more harm than good to the water heater, hence why we recommend the minimum 100 ppm.
Please be advised that using the water softener doesn’t eliminate the need of servicing the water heater, it simply makes it less frequent—for example, increasing the interval from every six months to annually.