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SO your water pressure at the main is poor, you can get a booster for that and that would theoretically bring up the water pressure of the combi too.
konastab01-
Yep, from the mains! I've tried googling but get mixed results for boosters... any more info?
edit: this looks good but not sure I have room for it... https://www.screwfix.com/p/salamander-pumps-homeboost-hb-booster-mains-water-boosting-pump-1-6bar/75286
chrisbmx116
Thanks all, that all makes sense...
Just realised my pressure is too low for Arte Forme though, I roughly measured it at 0.8 and they need 1 or above.
Lusso Stone are 0.5 and above, so I may be back to square one unless there is anything that can be done to improve flow from a combi?