"Andy Hall" wrote in message
...

This is the big advantage of a cylinder. You can make it adequately
sized to be sure that you will always have a plentiful supply,
regardless of the draw rate.

Need to size with a combi as it never runs out of hot water.

Thermal stores - any suggestions on them please.

The well known site on these is DPS. www.heatweb.com although the
cylinder manufacturers are making them as well.

The main advantages that you can get out of one of these are that

- the primary circuit can remain vented so that the bulk water in the
cylinder is not pressurised. Sealed cylinder pressurised systems
require a BBA or IoP approved installer to fit them

- The cylinder can store water at higher temperatures than if it is
used for hot water. It can be at 80 degrees rather than 60, so a
third more energy is stored in the same space.

Most store water at 75C these days.

If you are going the condensing boiler
route, it won't be as efficient
with a thermal store as it can be with a
conventional cylinder because
the operating temperature is higher.

You know little of HVAC.

It's also better to run the
radiators separately from the
primary circuit than from the store.

If the rads are run for the store backup electricity can be incorporated.
High wattage immersion cols are available.

What sort of cylinder should I go
for if i go down the convential route?

A fast recovery type. Vendors of these include Albion and Telford
among others. These have various arrangements to increase the
surface area of the coil - e.g. more turns, multiple pipes, etc. The
point is to increase the transfer rate of heat so that the water is
heated more rapidly, and if you have hot water priority arrangement
that the boiler is not taken from heating the house for too long.

The system should a DHW priority system when using these.

No need to go tank/cylinder as a combi or heat bank will be far better all
around.



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