Gas Boiler Integral By Pass

John.G · 20-03-2019 09:18PM #1

With respect to the above and link and quote "The boiler utilises the primary side of the DHW plate heat exchanger as a automatic integral by pass"

https://www.baxi.co.uk/-/media/websites/baxiuk/files/product-literature/baxi-duo-tec-combi/baxi_duo-tec_combi_erp_installation_and_service_manual.pdf?la=en&hash=69AFEC5BB873FBEDF61616A5B4ED31AD48CE0958

How is this achieved? and in a system gas boiler if a integral bypass is fitted, is this just a pipe+orifice between the flow&return?.

anthonyos · 20-03-2019 09:35PM

There is no plate heat exchanger in an intergas afaik

John.G · 20-03-2019 10:06PM

anthonyos wrote: »

There is no plate heat exchanger in an intergas afaik

That,s right (or no diverter valve) but I'm talking about a conventional combi boiler like the one (Baxi) above that states it has this integral by pass?

DGOBS · 21-03-2019 06:06PM

Hi John, its a small bore pipe between flow/return with a spring loaded bypass valve (so would only open when the pump is running but the system flow is blocked (by a closed motorised valve) and is designed to accommodate pump over-run.

It is however always recommended to install a system bypass and auto-bypass valve external to the appliance.

Gas Boiler Integral By Pass

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