domestic hot water temperature issue

We've had a rental 40 gallon natural gas Rheem water heater for 16 years. It ran beautifully and unless you were in the laundry room with it, you would never know it was heating. Even standing in the same room you would only hear a very subtle burner noise. We thought we'd be proactive and...

We appear to be having a problem with our hot water ever since a new boiler with hot water coil was installed in late 2017. The installed a mixing valve board with an electronic controller, and the system had many check valves, but they never installed a thermal expansion tank, and i saw spike...