Fully pumped hot water replacement
 

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

Fully pumped hot water replacement
 

In an earlier contribution to this discussion,
Brianb wrote:

I've 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

AIUI, a thermal store and heat bank are very similar, but they differ from
an unvented cylinder.

The all provide mains pressure hot water, but they do it in different ways.
In an unvented cylinder, *all* the hot water in it is at mains pressure -
thus requiring no cold header tank. There are a lot of safety issues with
this arrangement, and these tanks can only legally be installed by people
with the right qualifications.

In a thermal store/heat bank, the hot water is at only just above atmosheric
pressure (just like a conventional cylinder) but there is a large heat
exchanger *inside* through which mains- pressure cold water passes on its
way to the hot taps - getting heated as it passes through.

This type of installation is legally D-I-Y-able.

The store may possibily have yet another internal heat exchanger for heating
the the central heating water - enabling the boiler to operate more
efficiently than with a conventional system, since it can run continuously
on full power until the store is hot, and then switch off.

See the FAQ at http://www.diyfaq.org.uk/plumbing/pl...1.html#thermal
for more information.
--
Cheers,
Set Square
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Fully pumped hot water replacement
 

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

IMHO Everything you need to know about Thermal Stores/Heat Banks is he
http://www.heatweb.com/

D