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Alec Morrow
@alec-morrow
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Honorable Member
Joined: Jan 7, 2022
Last seen: Sep 4, 2025
Profile Activity
Topics: 8 / Replies: 208
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RE: High air source heat pump running costs – Vaillant AroTherm Plus

Are you using vaillant mixers for the floor? Or is there a pump for each floor zone? raise heat curve and shut down all the floor and see how the ra...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

@webcmg is you need a higher curve for radiators than the floor…but more heat means more energy consumed. and the floor temps need to be mixed d...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: 12kW Vaillant aroTHERM plus in the Scottish Borders: please help cure my COP envy

Just to be clear heat curves has nothing to do with the type of heat generator..I have gas boilers with heat curves on UFH as low as 0.1

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Balancing radiators

Again it will depend on control strategy if it’s compensated the getting a delta t of 5c may be impossible take a room temp of 19.5, a set point of...

4 years ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Balancing radiators

@saf1973 with on -off controls it may be beneficial to change radiators, but with weather compensation controls with a compensation room unit y...

4 years ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Balancing radiators

My understanding is this Balance for correct distribution of heat to radiators.heat pumps systems benefit from high flow rates so no need to look for ...

4 years ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Weather compensation and air source heat pumps

@adaml ask the manufacturers, for sure they will have a diagram or table but be careful understanding these things is a bit if a rabbit hole especi...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Weather compensation and air source heat pumps

Weather compensation just means the flow temperature to the heat emitters is hotter the cold it is outside. it’s been mandated on boilers in Germany...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

@mike-patrick all equipment supllied complies with U.K. regulations, but U.K. regulations do not promote optimal equipment, and that is a problem for ...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mains gas boilers

Indeed I suspected that would be the answer. it would be worth doing if it is straightforward ie cylinder next to boiler or both pipes serving ...

4 years ago
Forum
Well & Truly Off The Grid
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

An electronic mixer and a pump can be supplied for about £240..to replace the manual mixer and pump and with that you will have a system that complies...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

@mike-patrick this is all that is required by British regulations, it would not be installed this way in any number of countries where heating ...

4 years ago
Forum
Air Source Heat Pumps (ASHPs)
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