Can Vented Direct Water Cylinder draw straight from mains pressure?

rob1100 · Jun 11, 2009

HI
Been to a job today. No hot water. No water at all in fact from hot taps.
The job was in a shop which has no access to the building above. They reported that a month ago there was a leak above, tenants moved out and header tank was condemned apparantly.
Initially they wanted me to put in multipoints or similar to serve their needs however whilst looking around I found a direct vented water cylinder which was getting power but had no water going to it.
Suspecting that this is due to the header tank being condemned or turned off etc my question is this:

Can I tee into the cold water main supply after the shops meter and run a mains supply direct to the water cylinder?

Thus bypassing the need for the water to go up to a header tank and then back down again.

My concerns are expansion. Being that it is vented to the tank (that I cant get to see) will this be ok to continue venting here?

Also concerned about expansion back into the cold water supply coming into the bottom of the cylinder.

Have to give the customer a quote but thought I would get some experienced advice.

Thanks for your help.

dunno really

flat pack · Jul 28, 2009

its not the flow ,it the size of pipework i said before is for expansion

and the Accumulators like ww1 bomb / 1970

stuart_craigon · Nov 3, 2009

Hey, I'll help you on this one! What ever you do DO NOT attempt to connect a direct cylinder to main water, you'll kill your self and anyone else around! Contact:

McDONALD ENGINEERS
FLEMINGTON ROAD QUEENSWAY IND. EST.
GLENROTHES FIFE (Scotland) KY7 5QF

Tel : 01592 611123

Ask for Sandy Cooper or Jamie Stewart, Say that I put you on to them and ask about their combination cylinders or "The TIMEsaver all-in-one plumbing unit" Either that or you could have a look at:
http://www.mcdonald-engineers.com/images/literature/TIMEsaver.pdf
Or
http://www.mcdonald-engineers.com/images/literature/Copper%20Hot%20Water%20Cylinders.pdf

I hope this helps. They are a good company and exelent to work with.

Renewable M · Nov 10, 2009

I know how hard it is to get good insurance as a specific tradesman...... its unlikely any 'general maintenance' type man is going to be insured for every discipline that he meddles with. That would be a vast policy!!!!!

So what happens when it goes wrong?