Discuss anybody know much about the cylinders with integrated air source heat pumps in the Renewables area at PlumbersForums.net
The one I thought about (Ariston) had a CoP (coefficient of performance) of 3.0, i.e. 3kW of heating for 1kW of electricity. To compete with gas I needed CoP > 4.0. Another issue was that unless you have its inlet and outlet terminating outside the thermal envelope of your house, you are paying to heat the air it is extracting its 'free' heat from. And you needed a 12 Amp supply electrical supply, and have long reheat times (4.5 hours), etc.No problems just wondered how good they were
Thanks just wondered if they made sense if you wanted to go renewable
Sorry didn’t realise he was wanting DHW only. I read cylinder and assumed heat store/buffer tank.It doesn't qualify for RHI if it's only DHW, has to include Renewable space heating.
Eligible heating systems
Our Product Eligibility List (PEL) shows which technology types and products are eligible for the Domestic Renewable Heat Incentive (RHI).www.ofgem.gov.uk
Typical salesman's gumpf. COP of 3.0 at what air temperature and relative humidity? Internal water temperature of what? And so in real-world conditions, what is the COP?The one I thought about (Ariston) had a CoP (coefficient of performance) of 3.0, i.e. 3kW of heating for 1kW of electricity. To compete with gas I needed CoP > 4.0. Another issue was that unless you have its inlet and outlet terminating outside the thermal envelope of your house, you are paying to heat the air it is extracting its 'free' heat from. And you needed a 12 Amp supply electrical supply, and have long reheat times (4.5 hours), etc.
So, I loved the theory, but CoP > 1.0 is the only upside and IMO that's not enough to win if you have a gas supply and have to pay the going rate for grid electricity.
never mentioned dhw only it would be hot water and heatingSorry didn’t realise he was wanting DHW only. I read cylinder and assumed heat store/buffer tank.
Reply to anybody know much about the cylinders with integrated air source heat pumps in the Renewables area at PlumbersForums.net
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