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robl
@robl
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Honorable Member
Joined: Mar 23, 2022
Last seen: Apr 24, 2025
Profile Activity
Topics: 1 / Replies: 202
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RE: Worcestershire ASHP

Hi Pat! We have a tiny 2.5kW(thermal, 660W elec) gshp, 4kWp solar, MVHR, 150mm EWI, 30kWh V2G car, 200l DHW tank, 4 bed highly insulated retrofit ho...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Air source heat pump with ground air pre heat

I think that did use to be a thing, but it is fraught with difficulty. Mice getting in, mould, stagnent water pools. All of these can be tackled - g...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Low profile wet underfloor heating

I think you can make a pretty good guess that any floors installed prior to 1991 will have no insulation. A bit of googling gave U values over time (...

2 years ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Adding battery storage to solar with ASHP

Hard to imagine how a hybrid inverter would be ok here. Imagine you got an Octopus Go tariff, charged up the batteries at cheap rate. Then discharge...

2 years ago
Forum
Energy Storage
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RE: Keystone COPs? I'm not getting the efficiencies I expected on my Ecodan.

@sunandair You’re right, re-reading I wish I’d said it differently. Comparative measurements will be good! Caring, looking at the data is a great th...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Keystone COPs? I'm not getting the efficiencies I expected on my Ecodan.

I’ve never heard of a heatpump with MID certification - that would mean a certified accuracy of measurements. You can certainly buy heatpump power me...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is it good an additional insulation of the compressor?

I think the compressor would not like to be turned on when it is too cold (hence they often have heaters). Conversely, in warmer weather it may overh...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: GSHP COP with and with and without backup boiler

@cowshed_rich I don't think it's an inverter model - this says not: Perhaps you're right, and it's a "marginal COP" thing due to the DHW t...

2 years ago
Forum
Grounds Source Heat Pump (GSHPs)
Reply
RE: GSHP COP with and with and without backup boiler

That does sound surprising! I expect that you're right - the backup heater is likely to be an inline immersion somewhere. How do you measure the ...

2 years ago
Forum
Grounds Source Heat Pump (GSHPs)
Reply
RE: Low COP on Samsung 16kw Gen6

@catapult I’m pretty sure that black thing in your pic is a magnetic water trap. Strong magnets inside pick up bits of circulating rust flaking of...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: No spare parts for Vaillant Ground Source Heat Pumps in the UK & major corrosion issue is another problem for GSHP

An Electrician will be able to fit a meter to your gshp system, and I think it's the first step in understanding if it is functioning well. I underst...

2 years ago
Forum
Grounds Source Heat Pump (GSHPs)
Reply
RE: Heat pump delta T too low - 2c

@william1066 I think that you're right - dropping the LWT always improves the COP of the compressor. The DeltaT is pretty much irrelevent to the c...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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