Specification

For Water Heater and Hot Water Storage Tank Applications
ES-DET-M1
Job Name
–––––––––––––––––––––––––––––––––––––––––––
Contractor
––––––––––––––––––––––––––––––––––––––––––––
Job Location
–––––––––––––––––––––––––––––––––––––––––
Approval
–––––––––––––––––––––––––––––––––––––––––––––
Engineer
–––––––––––––––––––––––––––––––––––––––––––––
Contractor’s P.O. No.
––––––––––––––––––––––––––––––––––
Approval
–––––––––––––––––––––––––––––––––––––––––––––
Representative
––––––––––––––––––––––––––––––––––––––––
Series DET
Potable Water Expansion Tanks
Series DET Potable Water Expansion Tanks are designed to absorb the
increased volume of water created by thermal expansion and
to maintain balanced pressure throughout the potable water
supply system.
Heated water expands, and in a domestic hot water system the
system may be closed when the potable water system is isolated from
the public water supply by a one-way valve such as pressure reducing
valve, backflow preventer or check valve. Provisions must be made for
this expansion.
Series DET expansion tanks absorb the increased volume of water cre-
ated when the hot water storage tank is heated and keeps the system
pressure below the relief setting of the T&P relief valve.
It is a pre-pressurized steel tank with an expansion membrane that
prevents contact of the water with the air in the tank. This prevents loss
of air to the water and insures long and trouble-free life for the system.
These tanks may be used with all types of Direct Fired Hot Water Heaters
(gas, oil or electric) and hot water storage tanks.
Features
• Rugged flexible butyl diaphragm
• Field adjustable pre-charge
• In-line and free standing models
• Can be used with most standard
hot water heaters and storage tanks
Models
DET-5-M1 has
3
⁄4" male connection, tank volume 2.1 gal.
DET-12-M1 has
3
⁄4" male connection, tank volume 4.5 gal.
DET-20-M1 has
3
⁄4" male connection, tank volume 8.5 gal.
DET-35-M1 has 1" female connection, tank volume 14.00 gal.
Specifications
The potable water expansion tank shall be of drawn steel construction. It
shall have a Butyl diaphragm separating the air chamber from the water
containing chamber. Inlet connector shall be brass (Model DET-35-M1:
Stainless Steel). Materials of manufacture for the diaphragm shall be FDA
approved.
The potable water expansion tank shall be a Watts Model DET-
____
M1.
Note: The potable water expansion tank shall be installed in the
cold water service pipe line on the supply side of the water heater (or
water storage tank). A pressure relief valve sized and installed
in accordance with local codes must be incorporated in the system.
In those systems requiring a combined temperature and pressure safety
relief valve, the temperature and pressure relief valve should be sized
and installed in accordance with local codes. Adequate drainage provi-
sions should be provided where water flow
will cause damage.
DET-20-M1
DET-12-M1
DET-5-M1
DET-35-M1
Standards
Models DET-5-M1, DET-12-M1 and DET-20-M1
are Listed by IAPMO.
Certified to ANSI/NSF 61
Model DET-35-M1
Certified to ANSI/NSF 61
See chart on back
(73˚F/23˚C)
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.