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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 26, 2025
Profile Activity
Topics: 16 / Replies: 2638
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RE: Octopus design temperatures confusion

I suspect 60dc120 means 60cm high 120cm long double convector. SC single convector. Heat loss same so good, only issue seems to be rad size/flow te...

6 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Octopus design temperatures confusion

The temperatures you quote are the standard mcs minimum design temperatures. The MCS and grant rules allow them to be raised but not reduced. Try pu...

6 months ago
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Air Source Heat Pumps (ASHPs)
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RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

Sorry I didn't spot the pictures above. Buffer tank looks very squat (which would explain lots). How high is it and what is the vertical distan...

6 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Vaillant arotherm plus heat pump frost protection

@kentuk It occurs to me, have you got a timed heating schedule and if so what is it. Can you tell me why the indoor temperature was so low in the ...

6 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Winter climatic curves v Spring/Autumn climatic curves

Very sensible (you, not your installer). I suggest (if you haven't already) you set any TRVs to well above the desired temperature and any thermost...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

no diagram!

6 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Vaillant arotherm plus heat pump frost protection

Im sorry but I really don't understand from what you have said how you are running your heat pump (for example how can WC work when the outdoor sensor...

6 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Not a good January? My heat pump used 840 KWh of electricity

@roamingbull Whats the assessed heat loss of your house at what design temperature, and whats your house construction? Even estate newbuild is pretty...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant arotherm plus heat pump frost protection

OK. Im still not clear what is actually happening. Can you confirm, on 6/12/24 and 7/12/24 at those times, what were you expecting it to be do...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant arotherm plus heat pump frost protection

Sunday night was very cold where I am: - 2, I would definitely expect frost protection to kick in in this circumstance and be very worried if it didn'...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant arotherm plus heat pump frost protection

Ok. How do you know frost protection is triggering (as opposed to just normal operation)? With the outdoor sensor indoors how can WC work. I'm a ...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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