Morning,
Check that the showers are turned off (showers are on with the cut off valve in the shower heads turned on, this would be mixing the hot & cold together....).
Check that the thermostat on the tank is hard against the outer surface.
Just some thoughts
Rgds
Tex.
ps. I did have to pull my water heater out of the MH shortly after getting it, to repair loose wires to the heater element which had shorted and caused an electrical fire. Hope this is not your problem but happened to quiet a few people this time last year!!
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