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Air Sourced Heat Pump.

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A person today that I was talking to, that has had a new build home which was required by building regs. to have an air sourced heat pump for heating and hot water, complained that the system was slow to heat or cool as required. He said that he had to have underfloor heating installed. It was slow to warm the rooms on cold days. He recently had the system set to cool the rooms on the very hot recent days. But this morning was cooler and he required heating. Is this normal?


Z.
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    It’s one of the draw backs of heat source to using a boiler.
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    But then again you couldn’t chill the floor if a boiler.
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    Either the wet side hasn’t been designed correctly, or the user doesn’t understand how to use the system, or a combination of both.




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    Yes.  Heat pumps operate at a very low power compared with a gas boiler.  You should set the thermostat and leave them to do their thing.  In the winter, the heat pump could be running 24 hours a day.
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    And all these wonderful modern things assume good insulation.


    Gone are the days when umpteen domestic servants kept the coal fires burning!
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    Do heat pumps provide hot water in the same way as a combi or do they need tanks? If it's the latter, then it's going to be a right pain for a lot of people to switch from gas as there's probably nowhere for a storage tank.
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    A wet air source system in a new build? The biggest bit of bad design possible, because the COP is so poor. Full air con is the only way, and hot water from the heat pump a waste of time, immersion really the only useful option. Operating and installation cost undoubtedly more than Gas, but that seems to be the new normal!
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    Lower output water temperature is always the limiting factor of reactive heating with ASHP
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    Colin Haggett:

    But then again you couldn’t chill the floor if a boiler.


    But do we really need to chill the floors in the U.K?


    Z.


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    keylevel:

    Do heat pumps provide hot water in the same way as a combi or do they need tanks? If it's the latter, then it's going to be a right pain for a lot of people to switch from gas as there's probably nowhere for a storage tank.


    They produce a much lower output than a typical combi boiler.  Enough for a shower, perhaps, but not much else.  In practice, they need a hot water tank, and even then they need an immersion heater for a heat boost to sterilise the water every week or so.


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Community Rules & Guidelines