Watts TWH User Manual
For Residential and Commercial Applications
ES-TWH
Job Name
Job Location
Engineer
Approval
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Series TWH
Tankless Water Heater Valves
Size: 3⁄4" (20mm)
Series TWH tankless water heater valves are designed to simplify the installation, maintenance and operation of tankless
water heaters.
Features
• 3⁄4" FPT unions for connection to water heater (all models)
• 3⁄4" FPT unions for connection to water lines (UT models)
• 3⁄4" Quick-Connect end connections to water lines (QT models)
• 3⁄4" FPT connection to water lines (FT models)
• 3⁄4" Sweat connection to water lines (FS models)
• 3⁄4" FPT/sweat unions for connection to water lines (UTS models)
• Full-port, quarter-turn ball valve with color-coded tee handle
and union
• Quarter-turn purge and drain valve with hose connection and
tethered brass cap
• Optional 3⁄4" pressure relief valve 150psi (10.3 bar)
• Optional integral spring check valve in cold water valves
• Hot and cold valves certified to NSF/ANSI 61
• Staggered connection points for ease of installation and access
• Valves are suitable for most tankless installations
• No additional adapters required
• 600 WOG rated
Contractor
Approval
Contractor’s P.O. No.
Representative
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TWH-UTS-C TWH-QC-C
TWH-UTS-H
Specifications
A tankless water heater valve shall be installed where indicated
on the plans. The valve shall facilitate isolation of the water
heater from the water lines, water heater purging, draining and
a provision for a pressure relief valve. The valve shall be a Watts
Series TWH.
Materials
Body: Forged brass
Ball: Plated brass
Seats: Virgin PTFE
TWH-QC-H
Models TWH UTS HCN RV
Model Nomenclature
TWH tankless water heater
UT union with female threaded tailpieces for connection to water lines
UTS union with female threaded and sweat tailpieces for connection to
water lines
QC Quick Connect fittings to water lines
FT Female pipe thread connection to water lines
FS Female sweat connection to water lines
H hot water valve
C cold water valve
CN cold water valve without integral spring check
HC hot and cold valve set
HCN hot and cold valve set, no spring check
RV 150psi relief valve
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 without prior notice and without incurring any obligation to make such
changes and modifications on Watts products previously or subsequently sold.
TWH-QC-C
TWH-QC-H
TWH-UT-C
TWH-UT-H
C
C
S
-
TWH-QC-H-RV
C
C
C
B
A
NSF/ANSI 61
CERTIFIED TO
-CT
W
H
T
A
F
I
N
S
ANS
1
/
6
I
T
ERT
E
D
F
C
I
O
TWH-CTS-H
NSF/ANSI 61
CERTIFIED TO
UT-
C
TWH
-
A
C
B
NSF/ANSI 61
CERTIFIED TO
-
H
T
-
U
T
W
H
A
B
TWH-UT-H-RV
C
D
D
TWH-FT/FS-H-RV
C
TWH-FT/FS-CN
C
D
A
A
A
A
E
B
B
B
B
Dimensions — Weights
MODEL CONNECTIONS DIMENSIONS WEIGHT
A B C D E
in. mm in. mm in. mm in. mm in. mm lbs. kgs.
TWH-UT-C Union x Union 415⁄16 125 213⁄16 71 2 51 – – – – 2.2 1.0
TWH-UT-H Union x Union 6
TWH-QC-C Quick-connect x Union 5
TWH-QC-H Union x Quick-connect 7
TWH-UT-H-RV Union x Union 6
TWH-QC-H-RV Quick-connect x Union 7
TWH-FT/FS-CN Union x FPT/Sweat 4
TWH-FT/FS-H Union x FPT/Sweat 6 152 2
A Watt s Water Technolo gies Company
ES-TWH 1104 © 2011 Watts
15
⁄16 177 23⁄4 69 2 51 – – – – 2.5 1.1
5
⁄16 135 213⁄16 71 2 51 – – – – 2.0 .9
3
⁄8 187 23⁄4 69 2 51 – – – – 2.4 1.1
15
⁄16 177 23⁄4 69 2 51 31⁄2 89 37⁄8 99 2.5 1.1
3
⁄8 187 23⁄4 69 2 51 31⁄2 89 37⁄8 99 2.4 1.1
1
⁄16 103 21⁄2 64 17⁄8 47 – – – – 1.9 0.9
1
⁄2 64 17⁄8 47 31⁄2 89 27⁄16 62 2.1 0.9
USA: No. Andover, MA • Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Burlington, ON • Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca
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