I found this: http://www.managemyhome.com/mmh/maintena...xml&month=April Do you guys follow this advice? Being a new home owner, I never had to deal with it before. And even now, I am not sure if my water heater has such a circulating pump... Why would you want to shut this pump off for the summer? Doesn't the boiler still need to cool the heat exchanger during summer? The heater I have is this one: http://www.bradfordwhite.com/images/shared/pdfs/specsheets/251-B.pdf The owner's manual doesn't say anything about a recirculating pump. It runs on natural gas, but is plugged into the power outlet - I think the blower fan uses it.