converting vented to sealed system

[andyb64]

I'm after some advice,

I have a Glow worm hideaway 70 boiler which is designed to run a vented Central heating system. I need to remove the header tank that is in the loft and as such want to convert this to a sealed system. The problem is that in the documentation for the boiler it states that it shouldn't be connected up to a sealed system. However in the same document it also states that the header tank can be anywhere from 1-27 metres above the centre line of the boiler. If my maths is correct 27 metres give you a pressure of 2.65 bar. If I used a sealed system but ensure that the pressure never gets above 2.65 bar using a pressure relief valve do you see any problems with converting this system.

It will only be short term as the boiler will be replaced in the next 6-12 months.

Thanks in advance

Andy...

 

[blahblah]

Do you really think anyone serious on here is going to say that you're right and the people who designed and built the boiler are wrong?
Why don't you ask Gloworm?

 

[ratonnastick]

Give it a try it might last a couple of hours.

Try blocking the vent on the hot water cylinder and changing it to mains fed, just for fun

 

[kevplumb]

wont that make a mess

well it did when i tryed it

 

[PEDANTICVINDICTIVEMAN]

Phone Glowworm.

 

[kevplumb]

howay pedantic you can do better than that

 

[croydoncorgi]

If the makers say 'no sealed systems' then that's what they mean. If you go ahead and fit one and it goes bang and floods the place / burns it down, your insurance company will say 'Pity about that. The heating system was modified against advice so that the boiler blew up. No pay out!'

If you ignore a specific prohibition by the maker, you must be certifiably insane!