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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: 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...

1 month 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 ...

1 month ago
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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...

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

This smooths things out a lot, basically its useless. Thats nowhere near an average 10kW It looks like you switch heating off at night...

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

I have a he 7kW Vaillant which is good. My comment would be there is, sofaik (based admitedly on what others say and the specs) nothing particularly ...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan consuming 100kwh per day in new build!!!

This particular example is one of the worst I have seen here. Uninsulated buried primaries!, uninsulated pipework around the cylinder, system separat...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
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