Large extension added to my 3 bed property. Combi has been a pain in the arse
and now won't cut it with 2 main bathrooms.

My question is should I go for a system boiler with an unvented cylinder or
get a conventional boiler and have pressurised ch and again an unvented hot
water cylinder?

Plumbing in the extension hasn't started yet and I plan to put the unvented
cylinder in the gurage.

My plans were for the system boiler but I met a plumber who said to go
conventional.

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