[Trainer]

Richard, the fresh water heating spec is 55 degree temp rise at a flow rate of 1.5 gal/min.

Through contact of the fresh water coils with the heat transfer mastic is essential to hot water heating for showers. Enabling the diesel burner to allow the zone 2 pump to stir the tank assures a long hot shower.

Sure is a lot of work to accomplish the replacement of the guts of the tempering valve that I do in less than 30 minutes. This has solved loss of hot water many times.

The diagnostic test is to feel the hot water line coming out of the tank to the tempering valve and the hot water line to the coach from the tempering valve. Good hot temps on the line to the valve with loss of temp on the line to the coach equals replace the tempering valve guts.

If the coils are separated from the mastic, then then opening the heater to repair is needed.

But the enhanced maintanence of the heater with new cutoff valves is most helpful the few times they need to be used. Can never have to much insulation under the stainless cover.

Be sure to service the burner before installing in the heater, new nozzle correctly installed, clean combustion chamber, clean U-channels in burn chamber, clean flame sensor, ignitor point gap correct. All the best in finishing this maintenance.