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Post by rocketmanbkk on Jan 31, 2022 14:25:12 GMT
A customer with a combi boiler & 2 bathrooms.
They want more pressure.
Unvented?
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Post by cathoderay on Jan 31, 2022 23:11:40 GMT
You could but that wastes the whole point of the combi. Cant you get them better incoming pressure / flow?
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Post by tomplum on Jan 31, 2022 23:42:59 GMT
They need educating , combi works fine but, If someone uses another tap while you're in the shower, the pressure will drop, If you fit an unvented which, is stored water and will run 2 showers but, the hot water will be shared and can run out if the demand is high so you need to think, Do you want the work and charge them a shit load for a less efficient system or, Say Hey, manage your bathroom routine and arrange with the family who's requirement takes priority ,
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Post by dickpuller on Feb 1, 2022 7:25:03 GMT
Further to Tom’s informative reply. Check the incoming mains water pressure & flow rate. Also the HW Flow rate is dependent on the size/output of the Combi; 24KW = 10Ltr/min 28KW = 12 35KW = 14
But if the incoming main cold is piss poor, you may not get these flow rates.
The flow rate is easily checked with measuring jug or kettle. Test in the evening, around Dinner Time or peak demand.
P.S If the incoming cold main is the only shortcoming, you could always fit an accumulator.
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Post by battle1066 on Feb 1, 2022 17:53:21 GMT
I’ve fitted bigger storage tanks for people yet there still not happy - its all about hot water and time management as Tom says.
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Post by dickpuller on Feb 2, 2022 6:32:53 GMT
With a descent Mains Flow & Pressure, you can easily run two hot taps with a 35KW Combi. and, with a 40KW combi you’ll get 16-18 Litre/min, so very close to the performance of an UVC, which in most cases is around 20ltr/min.
Anyone unable to understand the principles of water mass Flow Rate, please ask & I’ll bore the tits off you with the details👍👍
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Post by rocketmanbkk on Feb 2, 2022 7:21:51 GMT
I’ve told them about combis & their ups & downs.
The balls in their court now
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