In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
I have the opportunity to get a Wm CGi-4 gas fired boiler. This model is the one with a forced draft motor. This boiler is replacing an existing natural draft boiler of basically the same size. The boiler shares a common flue with a gas fired hot water heater. My question is will the forced draft of the boiler back feed into the hot water heater, and if so what can be done to prevent this? Currently the flue size for the hot water is 3in the boiler is 5in and the chimney liner is 6in. The hot water ties into the 5in in a T would a Y be preferred. thanks for any help john