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New boiler and thermal store

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19 Feb 2025
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Hello.

I am reposting this thread with an update. Apologies if you have already answered but appreciate the advice.

I am looking to replace a potterton boiler suprima 70 installed in 1999. Coming up to 25 years is working fine but I may consider a replacement Due to kettling and fan noise. I have a gledhill torrent eco OV 210 installed in 2017 for a 3 ensuite shower house with 18 radiators.

It was suggested a Worcester bosch greenstar 24W RI would suffice. I did plug in some details in to the Worcester bosch webpage and it suggested the 30W boiler.

My dilemma upon reading is whether to also replace my torrent ECO OV with a sealed system like megaflo or a (sealed gledhill as suggested by BG) or to keep the store I already have given it is not that old.
I read that replacing for a sealed system puts strain on the rads and leaks could occur and I cannot be dealing with that uncertainty if I am to get a complete new system.
I will powerflush whatever I do.

Aside from all other questions is it silly not to replace the gledhill OV for a sealed system or should i just have a shiny new Bosch boiler and be done with it.(BG quoted me with powerflush £3.9k for above said boiler).

I imagine replacing the thermal store will be more expensive and outweigh any long term cost saving benefit for at least 20 years until I break even!!

If anyone has a similar set up or experience of these things, any help with recommendations would be appreciated.
Thanks again
 
A thermal store is entirely incompatible with modern condensing boilers, which should be set to have lower flow temperatures so that they actually work as intended.

Either keep what you have got until it fails - and with Gledhill products that won't be long at all
or sling the store and the rest away, and have a new system installed which is actually designed properly for the heat requirements of the building as it is today. That may involve changing some or all of the radiators.

No heating system will 'break even' - they are all a cost, and the benefit of them is that you have a warm house and hot water to use.
 

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