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Ask The Trades › DIY Forum › Plumbing Questions › Water head

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Water head (Read 10803 times)

gullrock

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Water head
Jan 6^th, 2006, 6:40pm

Advice please!!

I am installing a hot water tank in a flat and considering placing the cold tank on staging above it (the ceiling is about 9 foot high so allowing about 9inches for access etc the water level should be at about 7ft 6in - 8 ft). The kitchen taps are about 4 foot below the cold tank water level.

Will that set up give a sufficient head? Ther is no shower - only a bath and hand basin.

There is no room for a cold tank in a loft and I do not really want to go to the expense of installing a pressurized system either.

On the question of type of HW tank for this E7 set up. Is a combination much better than using 2 tanks as proposed?

Secondly, is there much advantage in using a specific E7 tank?

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billythekid

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Re: Water head
Reply #1 - Jan 6^th, 2006, 7:17pm

You should have plenty head for a bath/basin, wont be blasting out the taps but then I guess you aren't expecting miracles. I wouldn't say a combination cylinder would be better, although this is the most common installation of them, flats. If you can get more head with a seperate tank then thats the way to go imo.

it'll help too if all this is as close to the Point of Use as possible.

btk

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thescruff Global Moderator Trade Member Author Offline Who said plumbing was easy. Posts: 6037 Total Thanks: 147 For This Post: 0 Gender: Trade: Plumber	Re: Water head Reply #2 - Jan 6^th, 2006, 7:47pm Remember you can also get a good volume of water by installing larger then normal pipes
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gullrock

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Re: Water head
Reply #3 - Jan 6^th, 2006, 8:03pm

Ok thanks - tanks will be very close to bathroom and I will use 22mm to bath, but probably only 15mm to sink which is only about 12 foot away and with Hep2o will not have any elbows or joints. Presumably if I use a combination H/C water tankthe whole thing would need to be raised as high as possible on staging?

Any views on the the extra expense of an economy 7 tank over an ordinary one please?

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billythekid Trade Member Offline I love YaBB 1G - SP1! Posts: 3402 Total Thanks: 0 For This Post: 0 Trade: Plumber	Re: Water head Reply #4 - Jan 6^th, 2006, 8:17pm yeah put the whole thing as high as possible to keep your head of water>pressure up. Whats an economy 7 tank? i thought economy 7 was an electrical tariff for white metre heating and the like. ?? btk
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Lurch GDPR opt-out Total Thanks: 0 For This Post: 0	Re: Water head Reply #5 - Jan 6^th, 2006, 8:21pm [quote author=billythekid link=1136572822/0#4 date=1136578647]Whats an economy 7 tank? [/quote] I've been wondering that, standard tank but with 2 immersion bosses?
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Water head Reply #6 - Jan 6^th, 2006, 8:31pm An Econ 7 tanks has positions for two elements - top and bottom. Bottom for off peak, and top for a boost on-peak.
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gullrock GDPR opt-out Total Thanks: 109 For This Post: 0	Re: Water head Reply #7 - Jan 6^th, 2006, 9:13pm Plumb centre catalogue lists Grade 3 ( part L compliant) and also Economy 7 (part L compliant) the E7 one is more expensive!!
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billythekid Trade Member Offline I love YaBB 1G - SP1! Posts: 3402 Total Thanks: 0 For This Post: 0 Trade: Plumber	Re: Water head Reply #8 - Jan 6^th, 2006, 9:52pm ahh i know the ones. I think they are pretty good, although I wouldn't think they were that energy efficient. they heat and store a lot of water. How come you dont want to throw in a combi gullrock? btk
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Water head Reply #9 - Jan 6^th, 2006, 9:54pm Assuming lack of gas supply?? Oil and LPG can also be diffcult in flats, or in areas with little road access.....
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gullrock GDPR opt-out Total Thanks: 109 For This Post: 0	Re: Water head Reply #10 - Jan 6^th, 2006, 10:56pm No gas here, and electricity is likely to be the cheapest installation option. Flat on 1st floor so difficult for oil or gas tank anyway. Should I fit a HW tank with 2 separate immersions (top one for day boost?
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billythekid Trade Member Offline I love YaBB 1G - SP1! Posts: 3402 Total Thanks: 0 For This Post: 0 Trade: Plumber	Re: Water head Reply #11 - Jan 6^th, 2006, 11:01pm OK that's me on the same page now! LOL. i would say yes. This is a pretty common way of doing things up here. btk
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Lurch GDPR opt-out Total Thanks: 0 For This Post: 0	Re: Water head Reply #12 - Jan 6^th, 2006, 11:02pm [quote author=gullrock link=1136572822/0#10 date=1136588212]Should I fit a HW tank with 2 separate immersions (top one for day boost? [/quote] Have you got economy 7?
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gullrock GDPR opt-out Total Thanks: 0 For This Post: 0	Re: Water head Reply #13 - Jan 6^th, 2006, 11:30pm Have you got economy 7? Yes - already installed
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Lurch GDPR opt-out Total Thanks: 0 For This Post: 0	Re: Water head Reply #14 - Jan 7^th, 2006, 12:01am Go for an economy 7 tank then.
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gullrock GDPR opt-out Total Thanks: 0 For This Post: 0	Re: Water head Reply #15 - Jan 7^th, 2006, 9:02am ok thank you, I will probably use a combination tank too
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CWatters

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Re: Water head
Reply #16 - Jan 7^th, 2006, 2:34pm

I believe the pressure you get is 0.1 bar per meter head of water so you will need taps designed for very low pressure.

Later edit: I think I would make sure I did the installation so that if pressure and flow was a problem I could easily install a pump eg without having to rip out the existing installation.

http://www.pumpexpress.co.uk/pump_ex_whole_house_boosting.htm

« Last Edit: Jan 7^th, 2006, 2:45pm by CWatters »

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