Possibly a question more appropriate for thePlumbBoard or HeatingEngineersNet, but here goes ...
It has rapidly become very apparent that the Rayburn (aka Cheap Aga) is not up to the job of (a) cooking, (b) providing adequate hot water when required and (c) providing heat, other than within a 6ft radius of itself. It does try to do these things, but has asked us to ensure that an oil tanker arrives weekly to feed it to enable it to continue trying.
Not entirely surprised, and a replacement system was high on our list of probable projects.
There appear to be a number of advantages to a main pressure hot water system (lose the water tank in the loft, lose the 2x hot water cylinders in the airing cupboard, provide power-shower-type water flow in the currently inadequate showers). Some systems will allow a number of different heat sources, which'll be handy because we'll probably be installing a solar panel array sometime.
Anyone got any experiences - good or bad - of these systems?? We have good mains pressure, which seems to be the normal caveat for such systems.
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I've been reading a little on vented vs unvented systems, although it appears difficult to get unbiased comment.
What sort of building work do you do @frictionfraction ?
Good point. There's already a backup system in place which would be unaffected by replacing the main system.
Honestly it's a god send, all the annoyances of combi boilers dissapear. Ours is a relatively modest 4 beds, 2 bathrooms, both showers are standard thrmostatic and work really well (probably the main reason for prerssurised hot water). Basically you can have full pressure hot and full pressure cold at the same time. If we move somewhere larger I will almost certainly be looking at a megaflow.