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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Oct 18, 2025
Profile Activity
Topics: 18 / Replies: 3098
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RE: Difficult positioning of air source heat pump

@rikiarn Delighted to hear that the install went well. It looks neat. That buffer tank looks like its got only 2 connections, which is also w...

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

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

3 months 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...

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

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

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

3 months 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...

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

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

3 months 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...

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

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

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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