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That’s a good thought, but rather than a plate exchanger, what about a low low header?! Some LLH come with mesh filtration anyway and less likely to block over time. Just stick a filter on the primary return for additional boiler protection.
You could do that but in the past we have found that sediment still sneaks through and over time it can soil the water ways in the new boiler. Worst case scenario with a small plate like this one would be to replace it if it got blocked.
 
All much appreciated!

Ah...double ouch. Think this is one I will need to research and do most of the labour myself then, saving the actual boiler connection to someone registered.

Will need to check how the underfloor heating downstairs is plumbed but remain confused as to why at that point it wouldn't have been changed to a flow/return system. Can't imagine one pipe systems fair too well with underfloor heating. A separate combi boiler was installed in the extension which I have assumed covers the additional bathroom and ensuite but am now wondering whether this is what the modern underfloor heating is fed from and the basement system boiler solely covers the first floor single pipe system.
Once drained the removal is a big (ish) mucky job that sometimes takes brute strength and ignorance but it is mainly manual labour. You could do that yourself and it would save a fair bit.
Not a bad job in the warmer months (no heating required). You can always find a way to keep someone supplied with hot water for domestic purposes.
 
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Once drained the removal is a big (ish) mucky job that sometimes takes brute strength and ignorance but it is mainly manual labour. You could do that yourself and it would save a fair bit.
Not a bad job in the warmer months (no heating required). You can always find a way to keep someone supplied with hot water for domestic purposes.
Good to hear. I think the sensible thing would be for me to engage a plumber from the outset, explain the works I plan to do and where I would like them to step in just so that if they have a particular way they would prefer the pipes to run etc I can be as accommodating as possible.
 
Good to hear. I think the sensible thing would be for me to engage a plumber from the outset, explain the works I plan to do and where I would like them to step in just so that if they have a particular way they would prefer the pipes to run etc I can be as accommodating as possible.
Good idea.
 
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Do heat loss for upstairs rooms at 18deg as bedrooms. Repeat with internally insulated walls for each. Lag loft like crazy. Then rip upstairs out completely. No need to remove hidden piping.

Internally insulate then consider electric heating as it is only needed morning and bedtime? Heat will also rise from downstairs.
 

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