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Brief description.Converting from oil to gas.Upon renovation a few years ago split the second floor baseboard zone into four smaller ones, separate for each bedroom.Baseboard footage is about 50% more than required.The smallest zone is about 7000btu. Heat loss for the house of 3000 SQ. FT came to about 75-80kbtu based on my own calculation. Planning on installing GV90+4. 30 ga. indirect HTP ssp30.Total 5 zones plus indirect. A few estimates that I got, nobody bothered with the heat loss.Estimates ranging $13-18k for the boiler and indirect water heater, some suggesting CI, some HE condensing boiler.Nobody even asked about the size of the house.Nobody suggested a buffer tank either.Boilers offered were at least 130k btu.The question is: do I need a buffer tank to prevent a short cycling, when the only 7K zone calls for heat.Just came from Aaron's and GPS in central NJ, and they hardly know what a buffer tank is. One suggestion was that I only need a buffer tank if burning wood.Please help.