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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 23, 2025
Profile Activity
Topics: 16 / Replies: 2632
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RE: Buffers, hot water and cooling

The principal reason that heat pumps have minimum flow rate specifications is in order to ensure that heat can be transported away from the compressor...

1 day ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Buffers, hot water and cooling

It is very unlikely to break, but of course it just might if there is something unusual about your plumbing. Its obviously your choice whether to (a)...

4 days ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Buffers, hot water and cooling

Unfortunately even with hydraulic separation you do need to worry about flow rates unless you are happy to increase operating costs by 15%, because un...

4 days ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Buffers, hot water and cooling

Definitely do this. My dhw operates fine without a buffer or volumiser and your logic explains why. Agree If you are replumbing why no...

4 days ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Say hello and introduce yourself

Welcome. Do feel free to tell us about your project and ask any questions you have.

5 days ago
Forum
Introductions, Forum Rules & Updates
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RE: Is a Valliant Inline 6kW heater a BUS buster?

Just another thought - it might be worth thinking about the control strategy in relation to the backup heater. I think that the typical control strat...

6 days ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is a Valliant Inline 6kW heater a BUS buster?

When i was looking I encountered one installer who does this as standard. It's cheaper to buy a direct cylinder (no coil, just an immersion), a pump ...

7 days ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is a Valliant Inline 6kW heater a BUS buster?

It sounds like you are well organised. You want to aim for open loop operation on weather compensation only, no buffer, LLH or PHE between emitters...

7 days ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is a Valliant Inline 6kW heater a BUS buster?

Ok so that's 35MWh and 32MWh respectively, assuming 10kWh/l, indicative of 11-17kW assuming the boiler is 100% efficient (which it likely isn't) and t...

1 week ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is a Valliant Inline 6kW heater a BUS buster?

@guydeb It is going to be high loss. I have heard that the commonly assumed U values for stone walls is way to high, and the air changes is also o...

1 week ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is a Valliant Inline 6kW heater a BUS buster?

This has come up before; a close neighbour of mine did something similar and claimed the BUS grant, but of course that doesn't mean it is OK. I woul...

1 week ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Victorian Semi Retrofit / Extension ASHP and UFH Advice

Agree, but you may have a hard time convincing them, as an overestimated survey is their ultimate protection. If you can get their calculations (and ...

1 week ago
Forum
Air Source Heat Pumps (ASHPs)
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