Originally Posted by
mygirlsdad77
The new tank is rated between 60300 and 67000 btu all depending on your elevation, according to the tag in the pic. So lets say you are above 2000ft elevation wise in your location. This means you just lost 20000 btu with the new water heater. This could be just enough to cause your issue. Time to get the plumber back in and size the heater correctly, or maybe add another water heater or boiler for the heating equiptment. Sounds like they just hoped the new water heater would do the job of the old one, which apparently it isnt. Wish I had an easy cheap fix for you, but there just isnt one out there (that I can think of anyway). Wishing you the best of luck, and please do keep us posted on what the outcome is.