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Gravity hot water question
Hi to all. Need some advice. I have a customer with a converted gravity hot water system. Massive mains and massive cast iron radiators. Lots and lots of return water. Current boiler is a fairly new cast iron boiler with no means of protection against low returns Temps. Repiping would be costly. Was thinking of using the Taco Veridian vt2218 circulator and have it set up in the boiler protection mode. My main concern is the fact that the the return May take forever 2 reach acceptable Temps. The circulator will run slower until the return Temps are acceptable. I am concerned that the home may never heat properly if the circulator is running slow for a very very long time. Please advise. Thank you so much. I know ideally it should have some sort of bypass valve but not sure if that's a viable option at this stage in the game.