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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 21, 2025
Profile Activity
Topics: 17 / Replies: 2698
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RE: Octopus design temperatures confusion

Not exactly. Type 11 = 1 panel, set of fins, type 21 = 2 panels 1 set of fins, type 22 = 2 panels 2 sets of fins. Unfortunately SC could be 11 or 2...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

7 months ago
Forum
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...

7 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

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...

7 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 ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

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

no diagram!

7 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
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...

7 months ago
Forum
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...

7 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...

7 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'...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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