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Water overflowing into header tank - but from where ?

property.advert · 2011-11-07 23:27:56

My electric only house immersion heater blew and I wanted to replace it with an instant water heater. So I plumbed it in, as I have done in a few other properties without incident, and it was fine for a couple of days. However, today, an overflow / expansion vent from the old immersion heater suddenly started dripping…

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property.advert Posts: 4,086 Forumite

9 November 2011 at 1:29AM

I might have an answer.

I get the feeling (from sounds) that some hot water is being drawn by the kitchen mixer tap. Yet this has it's own cold at mains pressure so I discounted it initially. Perhaps it backs up to the other mains cold inlet underground outside the house ????

If fitting a NRV at this outlet does not resolve the matter I'll get someone in.

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