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robl

@robl

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Honorable Member

Joined: Mar 23, 2022
Last seen: Oct 27, 2025

Topics: 1 / Replies: 204

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RE: Vaillant flow rates, Delta T, buffer sizing - trying to get ASHP running well but hit a brick wall.

The temperatures that you mention are all quite low, which is great for efficiency (but not for a warm house when it's cold out). What really matters...

3 years ago

Forum

Air Source Heat Pumps (ASHPs)

RE: Smart metre installation – seamless or a potential nightmare?

Our smart meter install with OVO went fine. It's a lot bigger than the old meter we had before, but there was space. I find it more awkward to read ...

3 years ago

Forum

Electricity, Tariffs, Monitoring & Providers

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...

3 years ago

Forum

Air Source Heat Pumps (ASHPs)

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...

3 years ago

Forum

Air Source Heat Pumps (ASHPs)

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 (...

3 years ago

Forum

Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls

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...

3 years ago

Forum

Energy Storage

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...

3 years ago

Forum

Air Source Heat Pumps (ASHPs)

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...

3 years ago

Forum

Air Source Heat Pumps (ASHPs)

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...

3 years ago

Forum

Air Source Heat Pumps (ASHPs)

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...

3 years ago

Forum

Ground Source Heat Pump (GSHPs)

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 ...

3 years ago

Forum