DIY Doctor

Tapped into Mains Combi Boiler Feed and Pressure Drops

Postby Justme111 » Sun Aug 23, 2015 7:40 am

Hi All, new to the forum but need a little guidance.

I have a combi mains fed boiler. Yesterday i tapped into the mains feed to the boiler to provide a water feed for an outside tap.

When I run the new tap the boiler pressure drops and I have to refill the boiler.

Have I tapped into something other than the mains feed?? Or have I simply not understood that tapping into the mains feed will drop the boiler pressure when the outside tap is used?

Thanks all
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