Indirect hot water tank

Postby GARYF » Fri May 04, 2007 12:08 am


I am replacing my leaking copper cylinder (400mm x 900mm). I have low water pressure. If i replace it with a 450mm x 900mm, will there be a noticeable improvement. How large can i go without changing other items to compensate for the increase in stored water?


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Simply Build It

Postby thedoctor2 » Fri May 04, 2007 6:53 am

hi there are limits but think u will be well with in them there
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Postby thedoctor2 » Fri May 04, 2007 6:58 am

hi sorry misread your post there increasing your header tank will help with pressure, but not your hot water storage tank , howerver in saying that if it is all furred up things may well improve
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Postby dave p » Sat May 05, 2007 10:41 pm

[it probably wont help you at all (other than stopping the leak) is it both hot and cold supplies which are low pressure?? is your basin ok but not your shower? need a few more details
dave p
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Postby DONFRAMAC » Thu May 10, 2007 1:59 am

You need to raise the height of the header-tank in the loft-- the large one that feeds the cylinder with the water which is to be heated, and use at least 22 mm copper pipe between this tank and the new indirect cylinder. When I tackled this raising of the main header, I renewed it, with a modern plastic, flexible one, complete with thermal insulation pack.
By placing it as high as possible in the loft I have enough static head to use a blender shower, without a pump-assist. (I had used a twin-impeller pump for a year, but it siezed after a year as it was not continuously rated;-- 3 showers back-to-back was too much for it).
Using at least 22 mm copper for the hot-water output, will be a minimum, with reduction to 15 mm being very local to where it is req.
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