On Tue, 13 Aug 2019 19:38:48 +0000, David wrote:

snip

The Redring water heater above says there must be at least 1.7m of 15mm
cold feed between the heater and the next cold draw off to allow for
expansion. Less in 22 mm.

Otherwise an expansion vessel and non-return valve must be fitted.

An expansion vessel and non-return valve seems to cost more than the
heater; £67.99 for the heater and £79.95 for the expansion vessel.

https://www.screwfix.com/p/redring-m...-stored-water-
heater-1-5kw-6ltr/5314p

https://www.screwfix.com/p/zip-expan...eck-valve-247-
x-127mm/4309t

I'm now wondering why you wouldn't just run an extra bit of 22mm cold pipe.

Also wondering if that part is over kill.

Cheers



Dave R

--
AMD FX-6300 in GA-990X-Gaming SLI-CF running Windows 7 Pro x64

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