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Installing Single 2.0 bar Pump into Hot Water System - Help Needed

Postby Edie » Tue Mar 17, 2015 9:23 am


I'm planing to add 2 bar single pump to my hot water system, I've tried to have a plumber to come around but two were not interested as the job is "too small", one never showed up and the other didn't seem to know what surrey flange is. So I've decided to do it myself.

I've been reading online trying to understand what exactly needs to be done, I want to boost the pressure to all my hot water outlets (kitchen tap, two in the bathroom) and replace my old electric shower with a thermostatic one.

I have gravity fed system and so far I know I need to add surrey flange and single impeller pump, my questions are:

1) My cold water storage tank is 4 gallon, is it sufficient or needs to be changed?

2) I've read somewhere (can't find it now) something about shower head needing to be at least 1m below bottom of my cold water tank. This is not possible in my case, I live in a flat and bottom of my tank is at 1,65m and shower head will be at 2.2m. Could someone clarify this to me? I think I'm getting confused as cold water will be fed from my cold mains and hot water from my new pump.

3) Is this pump ok? ... ar-single/
or cheaper one like this will be enough: ... ar-single/

4) My mains cold water pressure is at 3.2 bar, I understand that for thermostatic shower I need to have equal pressure, will Pressure Reducing Valve set at 2 bar (same as pump) do the job? ... 22mm/32536

Any advice will be greatly appreciated :)
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Simply Build It

Postby proptech » Tue Mar 17, 2015 7:25 pm

Hi Edie

Please stop there. To do what you describe is going to cause all sorts of problems. It would seem that you've had dealings with the 'wrong' plumbers, they could have advised you far better. Can I suggest you take a look at using an unvented cylinder, so that hot and cold are both off the mains.
This is not a DIY job, and has to be installed by a specially qualified plumber, but is worth getting advice in that direction.
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