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View the thread, titled "gas system boiler hot water problems" which is posted in Boiler Advice Forum on UK Plumbers Forums.

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wta99

I should be grateful if you help me with the following query. I had a Worcester green star 30 CDI system boiler (natural gas) installed a couple of months ago. It is connected to a 210 litre unvented mains pressure water cylinder (indirect?) , together with a three channel seven-day electronic programmer (one channel upstairs heat; one channel downstairs heat; one channel hot water heating). To my disappointment, I note that whenever the central heating is turned on then the stored hot water is drained from the cylinder. I asked my installer/engineer about this and he informed me that I should turn the hot water heating on for about 20 to 30 minutes before I turned the heat on i.e. in order to ensure that the water in the cylinder remained hot. Clearly this is not practicable especially whenever one wishes to push a ‘boost’ of heat. Moreover, it represents a waste of energy to have to run the boiler for an additional period than is necessary for the central heating in order to heat the same water once again before the central heating comes on.
Would you please confirm whether or not it is feasible for the hot water tank to be isolated from the central heating? I.e. so that whenever the central heating is turned on, it does not drain the stored hot water from the cylinder. It is my understanding that such a scenario would be much more economical and efficient. It is clearly ludicrous to sacrifice all the stored hot water every time one turns on heat. I appreciate that there is a device called an optional integral diverter and I would welcome clarification as to whether such a device would address my problem. I look forward to hearing from you and I appreciate your assistance.
 
wta99 ... there is no way that a correctly installed and zoned system would extract the heat from your cylinder! They are . in effect, separate circulation 'zones'. Arew you saying that when the heating is on the water goes cold?
 
heating and hot water are totaly seperate there shouldnt be any loss of stored water regardless of whats calling i would be very concerned that some thing is piped incorrectly you could be running fresh water through your heating system which will cause rad failiures very soon
 
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