I just received estimate from heating plumber to repipe my boiler. It was not piped according to manufactuer specs (Burnham Boiler), as a result I am getting water hammer, water up in one pipe system and water coming out of main vents in cellar. When he gave me estimate he wants to replace my existing mc donnell water feeder and replace with Hydrolevel Water Feeder. I was wondering if anyone is familiar with this water feeder? Should I replace? Plumber did not mention it when he came to inspect. I have had the existing water feeder for approx. 10 years when boiler was replaced.