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PostPosted: Wed Nov 01, 2017 8:39 am 
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A year ago, I was advised to change the pressure regulating valve under the kitchen sink where the main supply comes into the house. As a matter of interest it had stuck wide open at 12 bar, the pressure in the road outside! It worked, no water hammer now.

The plumber used the preset operating pressure on the new unit at 3 bar, which means that we can no longer operate 2 showers simultaneously, which is a little annoying. I adjusted the setting upwards to 4 bar, which means it settles at 3 bar when water flowing, and 2 showers is now almost possible as long as no-one opens any tap elsewhere at the same time! I am told that fitting a larger PRV would increase the water flow available and permanently cure the problem. Is that advice correct, as I am confused by pressure/flow etc? A neighbour has suggested that my newly installed condensing boiler may not be able to deliver the amount of hot water needed for twin shower operations?

Help please!


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PostPosted: Wed Nov 01, 2017 6:57 pm 
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It would help if you told us the make and model of your boiler!

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PostPosted: Thu Nov 02, 2017 7:35 am 
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gas4you wrote:
It would help if you told us the make and model of your boiler!
And what type of showers you have and if there is tank system or not

Sent from my LG-K100 using Tapatalk


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PostPosted: Tue Nov 07, 2017 5:02 pm 
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gas4you, the boiler is an Intergas 28/24 HRE.

multiman, the showers are both simple types, of plastic hose, unknown maker, with water flow and temperature regulated through a plastic 'D' handle which makes for difficult control.There are no tanks, all fed direct off the water main.


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PostPosted: Tue Nov 07, 2017 5:42 pm 
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I would expect your boiler to deliver around 12l/min hot water, no different to any 28-30Kw combi.

Not really enough for two showers, or two hot taps to be used at the same time IMO.

Your problem will be lack of flow rate, rather than pressure. For the basics of normal home use, pressure doesn't affect flow rate i.e. you can have a high flow but low pressure or low flow and high pressure.

Better flow is achieved with larger bore cold water pipe coming into the property.

You need to measure the flow from a cold tap, e.g. kitchen sink.

As for the water hammer, it could be because of the high pressure, or a faulty tap/cartridge somewhere.

You could try fitting a mini expansion vessel to the cold pipe work, I always fit one of these to the combi cold supply when fitting a combi, but I do not know whether this is needed with the Intergas.

Razor will be along later to comment more thoroughly about your Intergas as he works for them and is one of the main experts for these boilers.

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PostPosted: Fri Nov 10, 2017 7:44 pm 
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Thanks for your suggestions gas4you.

I would welcome comment from Razor if he has knowledge of the boiler.

Although frankly I suspect I answered my own thread at the start by stating that all was okay when I had high pressure due to prv failure so should not expect 2 showers operation simultaneously now?


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