Question by nfjeees nfkrkfkrfr on October 19, 2011

A quick check with my ohm meter found a shorted hi-limit switch. After removing switch I found it had actually fell apart leaving the wires touching the header. (Thanks ASME) Seen this before on the standard heater but does not short to ground with plastic headers.

I need some help understanding what is the advantage of ASME over standard? I am seeing way more warranty claims on ASME than I ever did with standard heaters.

Thanks again for the help

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Comment by Dennis Garces on October 19, 2011

@Brian

ASME is required by code in some locations/applications.  They have a slightly thicker copper exchanger, metal header, and are pressure tested with an ASME rep watching.  Typically they are required in commercial applications like hotels and public pools.  With those places the water is generally not the best and sometimes the equipment is not cared for well.

Comment by nfjeees nfkrkfkrfr on October 19, 2011

Should I be selling standard heaters to my commercial customers since local code does not require ASME and their equipment is well cared for?

I see the HD heater has a different heat exchanger but I can't find a different part number difference from the standard heater and the ASME? Can I get the part number for the "Thicker" heat exchanger for the 250 & 400 so I replace the correct one in the future.

Comment by Dennis Garces on October 19, 2011

If code does not require asme, I wouldn't sell that model.  Yes, the HD has a cupronickel exchanger (copper with nickle added) which is a more durable alloy for more harsh environments.  I would sell that to any place that will get a lot of use or they aren't the most vigilant about the chemicals.

250 ASME exchanger (copper) - 474079 (after 3/24/09)

250 HD exchanger (cupronickel) - 474063 (after 1/12/09)

400 ASME exchanger (copper) - 474096 (after 3/24/09)

400 HD exchanger (cupronickel) - 474065 (after 1/12/09)