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USA Unvented cylinder - water pressure

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Tim0212

Hi, looking for advice about unvented cylinder. I had one installed as part of a horrific modular loft conversion that was recently finished. The water pressure in the bathrooms is poor, probably worse than when just had combi and I cant use two showers/bathrooms at one time which was the point in having it installed. When first installed it seemed good but then there was a leak in the system. Leak was fixed but pressure now poor. The tested cold incoming measures at 22 lpm and 3 bar but when i check this in bathrooms its less than 8lpm. The plumber is refusing to return as loft company arent paying him(think theyre going under) and his only advice is that the incoming supply is the issue. Im not convinced though due to rate during test and i've recently tested outside tap and its 3 times quicker than inside. The new shower in loft occassionally has fluntuating pressure that you can see by eye. Does anyone have any advice?
 
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No i have nothing from them. Apart from vertical cylinder can you explain other issues? I would be surprised if loft company would have used them if not gas safe as all part of contract for sign off and commissioning. Could they get away with it by saying they didnt specify cylinder (the loft company did?)
 
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Tim0212 said:
No i have nothing from them. Apart from vertical cylinder can you explain other issues? I would be surprised if loft company would have used them if not gas safe as all part of contract for sign off and commissioning. Could they get away with it by saying they didnt specify cylinder (the loft company did?)
Click to expand...

They installed it in that manner the buck falls with them
 
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I seriously cant believe this. Should i highlight anything other than the cylinder direction. He had discussed putting a pump on the cold water(under the stairs)? Is the pressure on outside tap good because all on 15mm pipe? If cylinder pipework was 15mm would it have been better pressure?
 
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Is that a vertical Tempest cylinder that has been turned on its side and mounted horizontally?

If so, WTF???

Time to get a new, G3 qualified, plumber in to survey the installation and quote for fixing any issues.

I hope you haven't paid the loft conversion company yet... :-(
 
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He’s a cowboy. Should’ve done the cold feed right at the start. An accumulator or similar could help solve your problem but it certainly shouldn’t be at your expense. And no. Pressure and flow rate are key don’t drop to 15
 
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Landmark lofts are the loft firm and landmark heating managed the cylinder installation. I dont think landmark heating are in trouble but think landmark lofts are. So incoming goes straight through house and under kitchen tiles. This and feed to cylinder(once correct) would all need to be replaced to get a good flow? The loft firms "engineer" that scoped the job and did pressure and flow tests never mentioned anything about incoming.
 
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Well he clearly wasn’t qualified. He should as a minimum have tested static and dynamic pressure as well as lpm did he do any tests or just turn on a tap and say ooh that’s good
 
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