Ar.1987

Thanks anyway

But the header tank was filled 1/2 -3/4 for well over a year without issue as advised when purchased

Had the issue before fixing the immersion It was doing this before immersion was fixed It had 6 pipes ?

The prv on the clarifier is operating correctly I do believe as doesn’t kick water pump on. But I turn the prv it will kick the water pump on

The header tank is for central heating I would of thought. The guy I purchased the boat off said to keep that header tank roughly 1/2 - 3/4 full. Which had never been a issue. But now if I put water in it, it comes straight out. Today I put 2 litres in and shortly after it was back out. Hence why I’ve put a massive container in the engine bay just why I try to sort this out. As the engine bay wasn’t rusty before grr. Yea the overflow pipe is on the radiator cap. So I’m to the point Of thinking I must have a valve that’s not working correctly?

I’ve had my narrowboat since 2017 and never had any issues like this. But as weather has been okay I haven’t been using the fire so been relying on the engine to heat water as my immersion was broken. Anyway I’ve now fixed the immersion and can get hot water great. But if I fill my header tank up that’s in my bedroom, it then comes out of the overflow pipe on my engine. It’s never done this before. I have a beta marine B-38KC with a PRM120 gearbox. Thank you