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We have installed many GSHP and ASHP`s over the years, only one was with a back up boiler because the largest ASHP we had available in single phase 240 volt at that time was rated at 10.5 kw @+2 deg C (we now have 17 kw 240 volt) plus at the property was a renovation the existing first floor...

I must add not all Heat Pump installations employ back up immersion heaters, Greenerheat install high quality units from IDM Energie, never have we installed a system with electric back up.

It all depends on what the outside air temperature is, the higher heating demand is usually when the outside temperature is lowest, not many people understand the effect low temperatures have on ASHP`s especially in our moist climate, many manufacturers boast 16 kw output but this is probably at...

I agree , Heat pump or even biomass is a better option, with heat Pumps your heating design is crucial, underfloor heating in screed is highly recommended as you can run an ASHP during the day when outside air temperatures are higher and store the energy in the screed, biomass is ok with ufh or...

Hi Chris these guys do emmeti manifolds but for a real quality product they do the Robot manifold, ready assembled complete with pump and regulating and safety stat, and best of all does not need to be balanced.

Underfloor heating outputs are calculated by totaling the R value of the individual components that make up the floor, the required heatload for the room is determined by completing a heatloss calculation, from this you can work out the energy required in watts per m/2, from these calculations...

15 years in the underfloor heating and renewable energy businesss