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Andrew[_22_]

On 13/03/2018 11:46, wrote:
On Tuesday, 13 March 2018 10:04:23 UTC, John Rumm wrote:
On 13/03/2018 03:05, The Natural Philosopher wrote:
On 12/03/18 22:09, John Rumm wrote:

In comparison, I made the change and am very pleased with the
(massive) improvement in performance...

It really all depends on the circumstances...

The thought of going bacl to header tanks and low pressure hot water
just amuses me really.

If you already have a vented system that works well, a fast recovery
cylinder, and have pumps installed for showers, then there is not much
value to be had ripping and replacing it for the sake of it.

In my case the existing system did not work at all in some respects and
was ill suited to the property. The only shower pump had died long ago.
So it was a no brainer since I was changing the boiler anyway.

Some vented systems work fine with slow recovery and no pump. As said there's only a reason to rework them when they don't work.

NT

There are still a couple of near neighbours with their original (1976)
baxi bermuda back boilers and 28mm gravity fed hot tanks. These must be
the ones that were installed properly first time around and the owners
have managed to defy BG with their standard advice about 'cannot get
the parts'.

Both houses are centre terrace so less heat loss to worry about.