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JamesPa
JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Feb 23, 2026
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Topics: 21 / Replies: 4283
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RE: How to control DHW with Honeywell EvoHome on Trianco ActiveAir 5 kW ASHP

The last photo is defrost for sure (or cooling, but presumably not at this time of year). You can tell because flow < return.Once you get close to...

4 days ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Oversized 10.5kW Grant Aerona Heat Pump on Microbore Pipes and Undersized Rads

@uknick Some very useful real world data from @old_scientist very relevant to your case. If your loss is really 3.5kW I think its less than 50% pro...

4 days ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

Interesting and possible I suppose. Of course this behaviour might be firmware-version dependent. I have never tried turning it off, but I think I w...

4 days ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Oversized 10.5kW Grant Aerona Heat Pump on Microbore Pipes and Undersized Rads

Very sensible. @old_scientist has very well described the design process starting with heat loss. You seem to know your whole house loss is ~3.5kW, ...

4 days ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

Mostly I find Vaillant controls good, but occasionally not. The legionella cycle warning (hot water) seems to come on before the cycle runs for examp...

5 days ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Need help maximising COP of 3.5kW Valiant Aerotherm heat pump

No it's not and i think what yhey said is nonsense (how would ut work?) Boost is, so far as i have been able to tell, a one off 'on'. However I thi...

5 days ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: How to control DHW with Honeywell EvoHome on Trianco ActiveAir 5 kW ASHP

Not if you are systematic and patient. The high OAT end is logically something like 20 at 20, or more practically something like 25-27 @ 16 or there...

5 days ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Oversized 10.5kW Grant Aerona Heat Pump on Microbore Pipes and Undersized Rads

OK here goes (you did ask!)   Radiator output is dependent on the area of the radiator and the temp difference (lets call it DeltaT) between ...

5 days ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Oversized 10.5kW Grant Aerona Heat Pump on Microbore Pipes and Undersized Rads

Not that you can buy economically. You can buy temperature sensors with displays for very little, but measuring flow is invasive so more complex. &...

5 days ago
Forum
Air Source Heat Pumps (ASHPs)
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