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I have an unvented cylinder. If my average water pressure is around 2.5 bar (static) but increases to over 3 bar at off peak times, will an accumulator store this at the peak pressure and deliver it (until it's all gone) to my shower in the morning?

I reckon that's what's happening Dan - does that make the case for adding an accumulator and getting 4 bar all the time, capacity allowing... or have I got that one wrong?

I can explain this - the garden tap isn't being used and is getting a build up of pressure. The static pressure (garden tap) was 4.2 bar tonight, I then measured 2.5 bar at the incoming main... took the garden tap reading again and, lo and behold, it matched at 2.5 bar. And just for Tony, the...

Cheers!!! :D :D :D

Thats good information for the OP and I have to defer to the experience you clearly have on this subject. I was just offering my own perspective on a post which hadn't had any replies. Angus.

Ok, problem solved... Combi valve replaced and static pressure has increased from 1 bar to 2 bar in master shower and from 0.2 bar to 1.8 bar at 2nd floor shower. Bath fills more quickly too. Thanks to everyone who contributed there knowledge! Angus.

Hmm, I seem to have supplied quite a bit of useful information and you appear to have supplied next to nothing. ':roll:' So that means anyone who's ever done a bucket filling test and taken a static pressure reading is wasting there time then? :lol:

12m will set you back around 1.2 bar at best, not including fittings etc. Allowing 0.5 for the PRV and I reckon your pressure at the top of the house will be around 1 bar. This is fine but not exactly a power shower. At first floor I would guess (finger in the air) a pressure of just under 2...

Hi, Having just spent the last week trying to improve the pressure and flow to my unvented cylinder I'll let you know what I've discovered. Pressure at my outside tap was similar to yours at around 3 bar and peaking at 4 bar, flow at the outside tap was around 20 l/min. In the cellar I...

Hi Simon, thanks very much for your reply. I've checked the discharge pipes and there's nothing coming from them so I'm pretty sure it's the combi valve which is at fault. Been on the phone to Reliance Water Company tech support today and they inform me that a pressure drop of 0.5-0.7 bar...

Presumably you're getting hotter water from your kitchen tap than from the mixer valve? If that's the case the calibration of the valve is most likely wrong and I'd have thought that removing the screw in the middle would allow you to pull the handle off a knurled spline and then recalibrate. :?:

I agree, much prefer the look of speedfit ... so much more attractive. :lol:

Haven't seen this particular model but in my experience if the temp is set too cool on a thermo mixer you undo the Allen bolt (or whatever holds the temp knob on) and turn the splined knob clockwise (or maybe anticlockwise), then re-fit the the control knob. IMO cross water are a fine British...

I've fitted heatmiser wireless stats in my house... They are brilliant! Digital programming on/off several times a day at different temperatures. Use zone valves to split your house in to different zones. Then programme the heatmiser timer/stats to different temps at different times - eg...

I'm not a builder but I'm self employed... and I can only say from my own point of view that it's better to be working than not - even if it's below what you'd normally expect to charge. Bills to pay and all that.

That's what I reckon too. There have been 3 "competent" plumbers worked on the house since the renovation and at least one has made a right royal f..k up... and none have spotted the low pressure problem! Correction, 4 plumbers have done work on the system, no 1 installed it and left saying...

Thanks for the reply Mathew, and yes I agree, trying to find a competent plumber ain't easy! The PRV is a fixed cartridge type set at 2.25 bar which is in a combination valve with connections to an expansion vessel etc. Today I measured the pressure in a number of places and the results...

The flow is 13 l/min as mentioned in the original post. Pipework is 22mm to the gledhill tank and tee'd off in 15mm to the kitchen tap. These are the locations I'm taking my measurements from and still don't understand why there is a relatively similar flow rate from the shower and the kitchen...

Thanks Tony, yes I have thought of calling a plumber but am just trying to understand the problem a little better, and if there is actually a problem, the shower does work after all. Just to clarify, the incoming main comes from the cellar in 22mm and tees off to the kitchen tap in 15mm then...

Hi Boilerman2, thanks for your reply! Have just taken it out and had look, it didnt appear very dirty, but gave it a clean anyway.Taken new readings and 1 bar upstairs and 3 bar at the outside tap so no real improvement unfortunately. It's a combination valve btw. Cheers.