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    VIESSMAN VITODENS 200W(35kW), ATAG E32C or VAILLANT 837 ?

    For some time I have contemplated replacing our Potterton Netaheat 16/22 with a Viessmann 200W or similar but I am unable to find a good reason. I carry out 99% of all household servicing and repairs but am concerned about modern "high efficiency" systems. During the Potterton's 30 years...
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