"Andrew Gabriel" wrote in message
.. .
In article ews.net,
"Doctor Drivel" writes:

When replacing a cylinder go for a quick recovery m,model. Part L is
'not'
quick recovery. They go by names of Super Duty Ultra Cal and the likes.

Don't do this unless you have a condensing boiler,
as it will force a non-condensing boiler into condensing
mode, and rapidly destroy it.

Nope. You put in a gate valve in the coil return to the boiler and balance
the coil to suit the boiler. When a boiler change you open up the gate.

Quick recovery cylinder is one part of a complete heating
system design. You can't drop one in without knowing the
rest of the system was designed to support it.

Hence the gate valve in the return pipe. Must cost all of £2-3.

You could insert a quick acting Reliance UFH blending valve (TMV) on the
coil flow and return. This ensures the boiler only pumps 80C heat into the
cylinder coil and keeps the return temp above the dew-point, and heats up
very quickly. Recommended for quick recovery coils and heating direct
thermal stores/heat banks.