I fitted a whole house pump a few years ago, which as the name suggests
pumps hot water to all outlets in the house. It also pumps cold water from
the loft tank to the shower to balance the unit. This system works well to
a point i.e. good hot water flow which provides a good shower (Newteam
Shower panel Diva-T, requires 3 bar) and can fill the bath quickly. We have
a standard indirect open vented DHW cylinder and cold water tank in the loft
raised about 1meter.
The problem is the first pump only lasted 2 years and this one is noisy and
getting worse. So what can I replace it with that will provide the amount
of water pressure that's required for the shower panel. I've read just read
the thread on Thermal Store vs. Heat Store, but can't say that I fully
understand how each works. How do these differ from a Pressurised Unvented
HW cylinder such as these
http://www.discountedheating.co.uk/s...Cylinders.html ?
If I wish to fit a new (bigger?) water tank, how do I calculate how much
weight I can load on the floor (1st floor, joist and floorboards), or is
installing a pallet type arrangement of 6x2 and flooring on top of the
existing airing cupboard floor adequate over a 1m sq area?

For info I have just had the boiler replaced with a condensing BAXI 100HE
system boiler, the CH system works fine and doesn't require any work.

TIA
Brian