Hi. I'm trying to get a Worcester Bosch 30CDi installed in our cellar. Does the pressure relief pipework have to drain downwards from the boiler, or can it come out of the boiler, and run up the wall to near the top of the boiler (but not above) to exit the house? The cellar is only half underground. I suspect that would mean that the pipe remains full of water after a vent, but I didn't think that'd be too much of a problem.
The manual shows it draining down, but doesn't put say it can't run a upwards then down outside.
http://www.worcester-bosch.co.uk/cache/file/483/greenstar-cdi-installation-manual.pdf
It's supposed to vent at ~3Bar, and maybe doing this would put pressure on the valve to stop it opening at 3bar, making it open at a slightly higher pressure, but as 1 BAR seems to be 33feet of water, and this'll be 1-2 feet, I expect the effect would be negligible.
I've been told that there's a Baxi that can definitely have the pressure relief valve higher up, but I don't want to have to get a specific baxi boiler just to save me digging a hole plus gravel trap outside the house.
Cheers for any opinions
The manual shows it draining down, but doesn't put say it can't run a upwards then down outside.
http://www.worcester-bosch.co.uk/cache/file/483/greenstar-cdi-installation-manual.pdf
It's supposed to vent at ~3Bar, and maybe doing this would put pressure on the valve to stop it opening at 3bar, making it open at a slightly higher pressure, but as 1 BAR seems to be 33feet of water, and this'll be 1-2 feet, I expect the effect would be negligible.
I've been told that there's a Baxi that can definitely have the pressure relief valve higher up, but I don't want to have to get a specific baxi boiler just to save me digging a hole plus gravel trap outside the house.
Cheers for any opinions