anybody know much about the cylinders with integrated air source heat pumps

[Gasmk1]

anybody know much about the cylinders with integrated air source heat pumps

 

[SimonG]

@quality is probably your man

 

[quality]

what type is it ? and issue?

 

[Gasmk1]

No problems just wondered how good they were

 

[Chuck]

No problems just wondered how good they were

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.

 

[quality]

As said they work well but if your on grid gas and its a retrofit job gas is normally cheaper

 

[Gasmk1]

Thanks just wondered if they made sense if you wanted to go renewable

 

[OffshoreGas]

Thanks just wondered if they made sense if you wanted to go renewable

Have you looked at the renewable heat incentive payments? I looked at it previously and found we would get about £1300pa in payouts.

 

[snowhead]

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

 

[Brambles]

The concept of recovering unused heat from within the building is excellent - the Ecocent (Earth Save Products) range are the only ones we have fitted. From a financial perspective the payback period is significant (12 to 15 years) for a capital expenditure of £10k plus.

Without eligibility for RHI they only appeal to people who seek renewable energy at any cost.

 

[OffshoreGas]

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

Sorry didn’t realise he was wanting DHW only. I read cylinder and assumed heat store/buffer tank.

 

[Ric2013]

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.

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?

 

[Renewable Installer]

Is it an exhaust air heat pump (draws air from ventilation system) or is it an air source heat pump (draws air from outside)?

 

[Gasmk1]

Sorry didn’t realise he was wanting DHW only. I read cylinder and assumed heat store/buffer tank.

never mentioned dhw only it would be hot water and heating