In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Good morning. In you very common situation where you have a boiler and water heater connected to a common chimney(just an example) why isn't the chimney oversized whenever only one of the appliances is running? In particular during the non heating season when the boiler never runs why aren't there issues with inability of the smaller water heater to heat the chimney and establish draft? This is an academic question. Thank you.