I currently own a John Wood GSW gas fired direct power vent 55 gallon hotwater tank that heats our 1100 square foot home with infloor radiant heat. The last 2 winters during heating season the tank has been making knocking and thumping sounds, more last winter but still works. Safe to say sediment is built up inside and heating the inside of the tank, being a rental if was most likely never drained and cleaned out. The date on the tank indicates it was made in 1999. Likely this is the original tank from when the house was built. It used to be a rental unit but when we bought the house we called and bought the tank for $40 due to its age, the rental bill was $89, crazy but HWT renting in Ontario is the norm, but not normal for me :) Due to the age Of this tank I am assuming that its life is just about over, so my main question is what brand of new tank should I get. Reading online reviews seems pointless as there are so many dfferent opinions that no *one brand stands out. Sorry for the long post, may have got a little carried typing. Thanks for any info or buying tips.

Is the water heater supplying both potable and space heating water?

Are you running potable water in the radiant floor?

Interesting how different one situation can be from the next. We have a Bock oil fired water heater (32 gallon, 75k BTU/hr) that provides DHW and radiant heat to a 2100 SF house in coastal Northern California. The floor heat system has a heat exchanger. The Bock has survived 28 years of service, and we've never run out of hot water even when our five kids and their kids come for holidays. The two of us use 15 gallons of hot water per day, average, total for dishwasher, washer, bathing, etc. I've monitored it for two years...15 gallons per day. We keep the house at about 70 degrees day and night, year round. I couldn't be happier with the service the Bock has provided.