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Illustrious Member
Joined: Jan 20, 2022
Last seen: Sep 23, 2025
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Topics: 16 / Replies: 2473
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RE: Double heat pump for DHW?

Thanks Bob. Could you just clarify what you mean by setting "the ASHP power at 12kW"? Yes, I appreciate that 12kW may well be the largest you'd su...

8 months ago
Forum
Domestic Hot Water & Cylinders
Reply
RE: Heat pump quotes: Advice needed

One other point about microbore, or any system where the pipework isn't adequately sized for the required transfer of heat... To obtain the desired ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump quotes: Advice needed

It might be 'standard' in that it complies with the way MCS-approved installers are required to undertake calculations... 😥 ... but the lower ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan Legionella cycle - immersion heater problem

OK @clockworks - I agree with your analysis. So what you're seeing here is due to the relatively slow rate at which heat is rising in the tank. ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan Legionella cycle - immersion heater problem

I've just superimposed those and adjusted the x-axis to make the time-frames coincide... I think Mitsubishi need to justify the need to send the i...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Double heat pump for DHW?

Thanks Bob. For such an elderly plate heat exchanger, yours is in a cupboard which is remarkably free of cobwebs! So that others can see what we'r...

8 months ago
Forum
Domestic Hot Water & Cylinders
Reply
RE: Double heat pump for DHW?

Can we have a photo of that plate heat exchanger please @bobtskutter ? Plus your comments on why this is preferable to having a coil inside the cyli...

8 months ago
Forum
Domestic Hot Water & Cylinders
Reply
RE: Ecodan Legionella cycle - immersion heater problem

You are making all the 'right' points @clockworks ... which gives me a dilemma because I'm meant to be installing an internal-insulation wall this aft...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan Legionella cycle - immersion heater problem

There are randomised delays available... but they're not properly implemented,and sometimes not at all. All Smart Meters have a randomised offset to...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan Legionella cycle - immersion heater problem

I'll raise that with the DESNZ committee who are creating the 'Standard' for Demand Side Response de-coupling of heat-pumps from the grid. There are...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecidan Legionella cycle - immersion heater problem

Yes. You've got it. And you should definitely throw the problem back at the installers.You musn't have the thermostat in the immersion heater and th...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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