Quote:
Originally Posted by park381
That may be all well and good in a new build house, but not always possible in an existing house. Most boilers are sited in a kitchen with the bathroom not directly above.
Have seen installations where combi boiler in installed in a garage, and the cylinder (first floor) has been removed, pipework linked so the hot water flow is to the first floor before coming down to the kitchen, that is a lot of water to waste, may be a wrong application/position of the combi boiler.
In most cases where a normal system boiler/cylinder is replaced by a combi boiler that is what happens.
With a combi there is always the drop in temperature of the incoming mains cold water in winter, all combi boiler manufacturers use the 35* temperature rise as a yard stick, so in winter the temperature of the hot water produced is relative to the reduced temperature of the incoming cold water. That is unless the combi boiler is way oversized.
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You are right, I always try and utilise the airing cupboard for that reason, if the garage is used, I would usually try and arrange the pipework to a more suitable position, if a combi is used correctly and correctly sized, the temperature difference should only be relevant to the time taken to run a bath, the temperature control should be set that when a basin or sink tap is opened, the water is the correct temp, then turned up to facillitate the running of the bath, otherwise, the tendency is to run the water too hot, then use cold water to cool down what you just paid to heat up = innefficiency. Also. with Worcester, the stated temperature rises are minimum rises, they are actually better than quoted, ie a 30si usually does 14 litres pm at 35c rise in mild weather.