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JamesPa
@jamespa
Moderator
Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 21, 2025
Topics: 16 / Replies: 2631
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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)...

2 days ago
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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...

2 days ago
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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...

2 days ago
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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.

3 days ago
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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...

4 days ago
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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 ...

5 days ago
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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...

5 days ago
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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...

5 days ago
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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...

6 days ago
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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...

6 days ago
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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 week ago
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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 week ago
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