[RE-wrenches] SHW Mixing Valves Vs. Anti-Scald

[August Goers]

Hi SHW Wrenches:



For our residential SHW installs a savvy client recently approached us on
the difference between mixing valves and anti-scald valves to temper the hot
water out of our tank. After doing a little research it appears that the
majority of our suppliers are simply using valves that meet the ASSE 1017
standard which is technically not supposed to be used for delivery water.
Here are some notes:



Watts Valve 1170 Meets Standard ASSE 1017

Watts Valve MMV Meets Standards ASSE 1017, 1069, 1070



Note that the following says ASSE 1017 devices should not be used to deliver
hot water to the user.



The following is copied from the Watts website. “
http://www.watts.com/pages/learnAbout/temperingValves.asp?catId=64”



A Word about American Society of Sanitary Engineering (ASSE) Standards 1016,
1017 and 1070



ASSE 1016 covers the delivery of water at the individual fixtures that are
adjusted and controlled by the user. Therefore, it addresses very precise
and immediate temperature regulation requirements. This standard covers
three types of valves: Pressure Balancing, Thermostatic and Combined
Pressure Balancing/Thermostatic. Watts ASSE 1016 listed valves meet the
thermostatic requirements of this standard.



ASSE 1070 is a recently approved standard and the newest of the three
standards. It covers control of maximum temperature to a fixture or group of
fixtures; such as sinks, lavatories or bathtubs. The device may either be
the final temperature regulation or have water further tempered downstream
with the addition of cold water.



ASSE 1017, on the other hand, does not address final temperature control at
fixtures and appliances. It is concerned with valves used at the source of
hot water for distribution to the supply system, and therefore allows wider
variation of the outlet temperature at higher flow rates.



ASSE 1017 listed devices should never be used to deliver water directly to
the user. These valves should be used in combination with an ASSE 1016
and/or ASSE 1070 listed devices.



What are you folks using out in the field? It seems clear from the info
above that we need to use valves that meet the ASSE 1017 standard but maybe
I'm over thinking it?



Best,



August





August Goers



Luminalt Energy Corporation

1320 Potrero Avenue

San Francisco, CA 94110

m: 415.559.1525

o: 415.641.4000

august at luminalt.com
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