following the EST best practice instruction
That best practice is about as much use as a chocolate teapot Tony.
following the EST best practice instruction
24-26kW.Let's assume coil rating 24kw.
Building heat loss 8kw.
......what size boiler would you propose?????
My son's family is the same size there is a 24kW boiler feeding a 125 litre unvented cylinder (Ideal Istor!!) and they have never complained about heating or hot water.we have a family of 6 all wanting showers/baths between the times of 6-9pm on a cold winter night
Although HW cylinders now expect around 20KW so they heat up quickly, there is no real need to add this to the central heating requirement.
So what would you allow if the boiler was fitted with weather comp, so the HW and CH can never be heated at the same time? (Bit difficult heating a cylinder to 60C when the flow temperature is 40C.)Although HW cylinders now expect around 20KW so they heat up quickly, there is no real need to add this to the central heating requirement.
Hmmm
http://www.bbc.co.uk/news/uk-england-york-north-yorkshire-29126161That best practice is about as much use as a chocolate teapot Tony.
I wasn't aware of this; that may explain how a 120 litre cylinder can supply hot water for six people with an en-suite shower and a bath.Istor is a poor example and works differently from a normal system type cylinder.
Presumably that's achieved by having a HW thermostat with a very small differential and the HW timed to be on constantly.The cylinder is constantly kept warm by the boiler and has a recovery time of 14-20 minutes depending on which version and will go from 15deg to 70max heat in this time.
Thanks for all the replies. I have two young kids and a wife. We are likely to be using the baths concurrently. We have three bathrooms in the house and I envisage two of them being used concurrently. Is there an issue with going with a 30KW boiler knowing that it may be over spec'd?
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