System type: Pumped - differential controller
System was working.
Differential controlled checked out fine, Used controller tester. Freeze control suspect. High limit set knob was offset. Started at 220 instead of 0. Insect residue in controller. Sensor readings reasonable.
Very low hot water pressure when two faucets were open. 3/4" out of water heater and reduced to 1/2" before going into wall.