Header tank above cylinder

[pauliepie]

Thanks

I just always thought that yes with the cold water storage tank, th higher the tank is above the highest tap/shower the better the col water pressure is coming out the taps/shower, but I cant get my hea round the pressure from a vented hot water cylinder. So is it right a cylinder can be fitted either on the ground floor first floor or a loft in a 3 bedroom semi detatched house just as lon as the mcw tank is above the highest tap in the house! If the cylinder was on the ground floor with the tank in the loft woul the hot water outlet be better on a first floor bathroom? look forward to any replies thank

-- pauliepie

[Bob Mannix]

As far as the cyclinder alone is concerned it matters not where it is. The static pressure at a tap is only determined by the vertical distance between the surface of the water in the header tank in the loft and the tap.

Is one looks at flow and pipes as wel, it's slightly different. If the hot tank is downstairs, there is a pipe running down to the hot tank and then back up to the bathroom. The pressure available in the bathroom (with no flow) is the same wherever the tank is but, if the tank is downstairs, it will have to drive water through a longer pipe run, which will introduce a higher pressure drop from beginning to end, than would be the case if the hot tank was upstairs. This will result in slightly poorer flow (depending on pipe bore, length, bends etc).

The taps downstairs will be less affected by the position of the hot tank as their static pressure will be higher and the difference in pipe runs should be less.

On balance, therefore, the hot tank is better upstairs, but only because of minimizing the pipe runs to the lower pressure taps.

[Doctor Evil]

yep.

Yep, and above the cylidner. The tank must be the highest point.

Doesn't make any difference. It is best to have the cylinder near the most used taps to avoid long dead-leg hot water draw-offs; lots of cold before hot comes through. You could have a secondary DHW pumped loop, that pumps hot water to each tap for instant hot water at the tap.

In ye olden dayes, a solid fuel boiler in the kitchen heated a cylinder, on the first floor by gravity circulation. The cold tank was conveniently in the loft. Amazingly this setup is still being used when all is pressurised or fully pumped. Installers will fit boilers in kitchen, which is pain in most circumstances, and a cylinder on the first floor, when all the loft is there to store both and liberate much needed cupboard space in tiny British homes. An airing cupboard can easily be created by running the boilers flow and return pipes around the cupboard or by using a small radiator on the back wall.

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