In order to obtain maximum efficiency from your heat pump and underfloor heating, we recommend the use of Lewis Plates which allow you to convert a joisted floor system into a screeded floor.  Please read more about them to understand why they're an essential part of the floor structure.

We do not recommend the use of aluminium plates in a joisted floor with underfloor heating and a heat pump.  Alumium plates need to be serviced by a boiler delivering at least 60C.  Generally, alumium plates are intended to be installed directly under a chipboard floor without added screed.  The result is that although they transfer heat quickly, heat cannot be stored within the floor makeup.  The knock on result of this is that the boiler (in this case the heat pump) will have to keep clicking in to maintain room temperature which of course reduces its efficiency.