Rudd STID40 User Manual
Indirect Water Heaters
Available in 30, 38, 45, 75 and 110 Gallon Models
Rheem-Ruuds indirect coil tank water heaters offer a cost effective water
heating alternative. These units use indirect water-to-water heat transfer by
circulating boiler-fed hot water through a coil inside the water tank. Theyre
ideal for applications that use boilers for space heating.
Construction Features:
• Built to last –
tank is manufactured from heavy
gauge steel. Longer life equals a
higher “return on investment”.
Outer jacket is made from steel
and powder coated for a lasting,
durable finish.
• High temperature porcelain
enamel protects all tank
and coil –
and maximizes corrosion
resistance.
• Factory installed automatic
temperature controls –
immersion aquastat on all models.
• Factory installed brass
drain valve
• Sediment reduction inlet –
standard on the STID80 and
STID120. Reduces sediment
buildup on the tank bottom –
increasing operating efficiencies
and tank life.
• Temperature and pressure
relief valve –
CSA/ASME rated and factory
installed.
• 1-1/2" Coil diameter –
larger diameter, results in higher
recovery and less pressure drop
through the coil – smooth surface
on the coil resists lime build-up.
• 2" Non-CFCfoam insulation –
provides superior insulating quality
and decreases standby heat loss.
• Two heavy-duty magnesium
anode rods –
inhibit corrosion and maximize
tank life.
• Factory installed
dielectric nipples –
provide greater insulating
protection against electrolysis.
Tested in accordance with GAMA Indirect-Fired Water Heating Standard
IWH-TS-1 – March 2003.
Continued on reverse.
Indirect Coil Tank continued.
GH
A
E
F
D
C
B
Cold Inlet, 1" NPT
Hot Outlet,
1-1/2" NPT
Anode Rod
Anode
Rod
T&P Relief Valve
From Boiler,
1" NPT
To Boiler,
1"NPT
Drain Valve
Aquastat
G
Cold Inlet,
3/4" NPT
Hot Outlet/
Anode Rod,
3/4" NPT
Anode Rod
Aquastat
T&P Relief Valve
From Boiler, 1" NPT
To Boiler,
1" NPT
F
D
C
E
B
A
DIMENSIONAL INFORMATION
MODEL SHIPPING
NUMBER UNITS ABCDEFGH
STID30 inches 22 35-3/4 27-3/4 18-1/2 11-3/4 6-1/2 4-1/2 N/A 180 lbs
STID40 inches 22 42-3/4 34-3/4 31-1/2 16-3/4 6-1/2 4-1/2 N/A 226 lbs
STID50 inches 22 48-3/4 39-3/4 31-1/2 16-3/4 6-1/2 4-1/2 N/A 231 lbs.
STID80 inches 24 64-1/8 57-1/8 33 19-1/4 855 297 lbs.
STID120 inches 28 65-1/4 57-3/4 33-3/4 16-1/4 8-3/4 5 6-1/2 397 lbs.
APPROX.
WEIGHT
FIRST HOUR RATING (gal) @ Coil Output (Btu/hr)
MODEL CAPACITY DRAW FRICTION LOSS* 180°F, 180°F, 180°F, 200°F, 200°F, 200°F, 200°F,
NUMBER (GAL) (GAL)
STID30 30 25 2 115 @56,000 117@ 57,000 118 @ 58,000 138 @ 71,000 144 @75,000 149@ 78,000 154 @ 81,000
STID40 38 33 3 173 @89,000 183 @96,000 191 @101,000 214 @115,000 226 @ 123,000 235 @ 129,000 243 @134,000
STID50 45 40 3 180 @89,000 190 @96,000 198 @101,000 221 @115,000 233 @ 123,000 242 @ 129,000 250 @134,000
STID80 75 70 5 233 @ 104,000 245 @ 111,000 254 @117,000 277 @132,000 292 @ 141,000 304 @ 149,000 314 @ 155,000
STID120 110 102 5 265 @ 104,000 277 @ 111,000 286 @117,000 309 @132,000 324 @ 141,000 336 @ 149,000 346 @ 155,000
ll data obtained through testing in accordance with GAMA INDIRECT-FIRED WATER HEATERS TESTING STANDARD IWH-TS-1_MARCH 2003
A
At 8 GPM
*
**Coil Input (temperature, flow rate). Ratings based on 77°F rise with 58°F inlet potable water.
Note: First Hour Rating = First Dray + Continuous Draw
Warning: Installation should be in accordance with all national and/or local codes.
In the absence of local codes, refer to NFPA 54 or ANSI Z.21.10.1.
Caution: The recommended maximum hot water temperature setting for normal residential use is 120°F. Rheem recommends a tempering
valve or anti-scald valve be installed and used according to the manufacturer’s directions to prevent scalding.
Pressures (all): Test pressure, 300 psi; working pressure, 150 psi
Standard Voltage (all): 120V, 60 Hz, 1P
T&P valve installed
TANK FIRST HEAT SOURCE
(FT. W.C.) 8 GPM** 10 GPM** 12 GPM** 8 GPM** 10 GPM** 12 GPM** 14 GPM**
STID80 & STID120
STID30, STID40
& STID50
Limited Warranty
This product features a lifetime residential limited warranty to the original owner when
installed in a residential application and a three year limited warranty when installed in
non-residential applications. Please refer to the Warranty Information Certificate for
complete warranty information.
In keeping with its policy of continuous progress and product improvement, Rheem-Ruud reserves the right to make changes without notice.
Rheem Water Heating • 101 Bell Road, Montgomery, Alabama 36117-4305 • www.rheem.com
P R INTE D IN U.S .A 0 3 /10 W P F O RM N O. R R102 C- 3I D Re v. 1
WATER HEATERS
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