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By John Carroll · Posted
I have a feeling that it all revolves around the flowtemperature measurement or what the boiler's PCB perceives the actual flowtemp is, even though the boiler does eventually return to "normal" and your measured readings correspond to the displayed reading. If, for whatever reason, the flowtemp is sometimes perceived to be as much as 5C below the targettemp then the burner output will be outputting as much as +7.53kW (21%) more than that required to satisfy the actual targettemp, even a error of 2/3C is a substantial increase in firing of ~ 3.8kW (10.6%). -
I think you need a certain number of air changes per hour to keep all fresh. With trickle vents it’s a blow through. But with MVHR one still (as I understand it) get a good flow through if fresh air. It at first appears confusing that we have a really low air change score to make MVHR worth having, but that’s a test if the leakiness of the house, not the number of air changes that a good ventilation system will give. -
Excuse my ignorance, but why do you need such a higher number of changes per hour with a non-heat recovery system? -
I honestly couldn’t disagree more. But as we’ve not built the house yet my opinion is not based experience, just theory. However I do know from experience that moving air takes a lot less energy than heating it.
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I think we’re actually closer in position than it might appear - though perhaps drawing different conclusions from it. You’re right that Section 75 isn’t a forum for debating where industry responsibility ought to sit. That’s precisely why I’m not relying on what is customary, typical, or widely tolerated in the trade, but instead on independent assessment of whether the actual outcome of the service supplied meets the standard of reasonable care and skill. Where I part company is the suggestion that persistent condensation and mould are merely “subjectively unacceptable”. These are objectively observable outcomes, not matters of taste, and they are exactly the kinds of issues that reasonable care and skill are meant to prevent - regardless of how common a particular installation detail may be. You’re also right that an expert will examine whether a competent installer should have identified the sub-threshold detail and either mitigated it or flagged it before installation. That question sits at the heart of the dispute, which is why speculation about how often this is overlooked in practice doesn’t really resolve it. I appreciate the confidence expressed about how an expert might conclude. I’m comfortable letting evidence rather than expectation decide that point. If the conclusion is that the underlying fabric alone is responsible, I’ll accept it. If not, responsibility will follow accordingly. Either way, I agree - it will be interesting to see the outcome, and I’m happy to report back once it’s determined.
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