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

August Goers august at luminalt.com
Thu Jun 17 09:03:31 PDT 2010


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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