Hi,
Have moved into a house, and should have really turned on the hot tap
before we purchased, but we didnt and are now left with a dribble of a
shower. The property is a 1920s semi with a baxi WM 532 RS boiler, 8
radiators one bathroom usual appliances and an airing cupboard with a
hot water cylinder that has very poor insulation. In the loft we have
the usual header tanks (Not very high). Although the boiler works
perfectly never even hear it, we were going to look at replacing with
a more efficient one and was thinking of a combi, luckily we didnt
make that decision.

We are now looking at replacing the ho****er cylinder with either a
pressurised unvented cylinder, however my only concern is where the
pressure relief would be run, also the mains supply is only 15mm pipe
with no possibility of upgrading (as its a shared supply with next
door), also I have found out that my boiler would not be suitable for
this type of system so would require upgrading.

The other possibility is the mains pressure vented cylinder but know
little about these, would they offer the same pressure as the unvented
type? also have been looking at boilers and most say 22mm gas inlet
the supply to the boiler is only 15 mm would this be a problem?

So in summary my questions a
1) What would be best a vented or unvented mains pressure HWC?
2) Would increasing the header tank by a meter benefit the shower
much? (at present theres only bout 1/2m drop from the tank to the
shower.
3) Will the 15mm gas supply be a problem?
4) Will the 15mm mains water in let be a problem?
5) what rough cost im in Essex.

Thanks for any help
Olly