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Is it possible to use a Salamander CT55+ XTRA as a mains booster before combi?

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26 Nov 2025
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Hi all,

I’ve have a Salamander CT55+ XTRA pump lying around and was wondering if it’s technically possible to temporarily fit it just after the internal stop tap, before the combi boiler, to boost incoming mains pressure.

I know it’s not what it’s designed for (and Salamander HomeBoost is always recommended ), but the HomeBoost is a bit pricey and I already have the CT55. I’d obviously make sure to fit a non-return valve and isolate it properly, and I’m aware of the warranty implications.

Has anyone tried this or seen it done? Would it actually work in terms of improving flow and not causing issues with the boiler? I’m not expecting miracles , just trying to see if it’s a viable workaround before I shell out for a proper mains booster
 
Seals on this pump are not designed for mains pressure
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Thanks for all you replies. So follow up question which is probably a no but is there any cheaper alternative to the Salamander Home boost or Stuart Turner Stormboost
 
These, I think are limited by the 12LPM regulation for mains boosting, is this flowrate good enough for you?
 
Unfortunately the mains booster pumps are all pretty similar and cheapest is around £250 and as suggested, mains cannot be pumped more than 12L/Min.
 

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