Cykinder in loft

[NickH]

Got to do a bathroom soon which will involve moving the hot cylinder up into the loft, problem is the roof is quite low and with a coffin water tank and a 42" cylinder the most I can get is the base of the tank about 6" above the top of the cylinder. Can you foresee any problems this might cause ?
thanks, Nick

 

[NickH]

Sorry I may have explained it badly, the cylinder is indirect and vented. I can get the base of the 50 gal storage tank about 6" above the top of the cylinder and the heating f/e tank about 24 " above the cylinder.
cheers, Nick

 

[MarkB]

Can you change to a sealed primary circuit and an unvented cylinder or a thermal store? If you stick with a fully vented system I think you'll have problems with the heights of the vents.

Mark

 

[justlead1]

Hi The standard problem when cylinder is subject to limited head is the sucking of air into the dhw system when say bath tap turned on. This can be overcome by over sizing the cold feed to the cylinder. Good Luck

 

[NickH]

The existing cylinder is fairly new and so the customer is reluctant to change it or any of the heating components so I've really got to work with what's there. I'll fit a new cold tank (coffin) so it would be easy enough to put in a 28mm feed to the cylinder. Do you think that would do it ?
If its likely to cause a problem I will talk her out of it. Has anyone used a torpedo cylinder ? I could obviously get a bit more head on that but would it be enough.

 

[justlead1]

Hi A 28 mm cold feed will suffice if is not a three story building with bath on ground floor. The head at sanitary fittings will remain the same, is just the down leg of the hot water delivery pipe that can pull more water than the cold feed to cylinder can deliver, this results in air being drawn in the vent to break the vacume. ( you get water and a lump of air and this is repeated as long as the tap is on. Good Luck