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190 Degree Domestic Hot Water
I recently got involved in a job where a Slant Fin Boiler and a Turbomax indirect waterheater were specified and installed in a convent. The problem came when we had to supply 180 degrees to a commercial dishwasher. The rep said to let the Turbomax produce 180 degree water for the dishwasher and temper down the water to the rest of the domestic system consisting of showers and sinks with a mixing valve.
I have a concern with keeping 180 degree water in a system that if the mixing valve fails could migrate into the rest of the domestic system and seriously hurt someone. After speaking to the contractor we decided the best method may be to put in a second Turbomax dedicated for the dishwasher to meet the code of having 180 degree water to a dishwasher in a commercial establishment and run the original Turbomax at a lower temperature for the rest of the domestic system.
Do you feel this is overkill to have the two indirects in this system? I think it is the safest thing to do but I am not sure if we are being too cautious.