Brochure

NOTES:
** Add “P” for packaged boiler (WTGO-3
through WTGO-6 only). Add “A” for
boiler only (WTGO-3 through WTGO-9).
(1) No. 2 fuel oil-Commercial Standard
Specification CS75-56. Heating value of
oil-140,000 BTU/Gal.
(2) Based on standard test procedures
prescribed by the United States
Department of Energy at combustion
condition of 13 1/2% CO2 and -0.02”
W.C. draft.
(3) MBH refers to thousands of BTU per hour.
(4) AHRI gross output.
(5)

Net AHRI ratings are based on net
installed radiation adequate for the
requirements of the building, including a
piping and pickup allowance of
1.15-sucient for normal conditions.
Provide additional allowance only for
unusual piping and pickup loads.
(6) Tankless heater rating is in gallons of
water per minute, heated from 40
o
F
to 140
o
F with 200
o
F boiler water
temperature-tested in accordance with
I-W-H Testing and Rating Standard for
Indirect Tankless Water Heaters Test
with Boilers.
■
Factory Tested and Assembled Cast
Iron Section Assembly (jacket and
collector hood are not assembled on
7, 8 and 9 section blocks)
■
Tankless Heater (P-units) or Tankless
Opening Cover Plate (A-units)
■
Insulated Steel Jacket
■
Aluminized Steel Flue Collector
Hood with Flue Cap on Top Outlet
(convertible to rear outlet)
■
Swing-Away Burner Mounting Door
■
Refractory Blanket and Target Wall
in Combustion Area
■
Circulator (Taco 007)-When Ordered
■
Comb. Temp. Controls, LWCO &
Circulator Relay (all P-units/A-units
ordered with tankless heater)
■
Electrical Junction Box with Wiring
Harnesses
■
Junction Box Cover Plate with
Service Switch
■
Two Vent Pipe Brackets
■
Pressure / Temperature Gauge
■
30 PSI ASME Relief Valve (boiler
sections tested for 50 PSIG working
pressure)
■
Drain Valve
■
Barometric Damper
■
High-Eciency Flame-Retention
Oil Burner (Beckett AFG, Carlin
EZ or Riello). Specify 2-Stage Fuel
Unit (optional) if Required
■
Vent Damper Kit
■
W-M 5 & 10 Year Homeowner
Protection Plan
■
W-M Indirect-Fired Water Heaters
OPTIONAL EQUIPMENT:
Tapping Size
Control
B
2
E
3
H
L
N
R
1
1 1/2
1/2
3/4
3/4
1/2
3/4
Alternate return - “A” units only
Pressure/temperature gauge
Drain valve
High limit/circulator control
Piping to expansion tank or automatic air vent
Relief valve
(inches) Location
P-WTGO Front A-WTGO FrontSide Back Intermediate
DIMENSIONS
STANDARD EQUIPMENT:
Model P-WGO
A-WGO
Return B L
WTGO-3
WTGO-3L
WTGO-4
WTGO-5
WTGO-6
WTGO-7
WTGO-8
WTGO-9
Dimension (inches)
1 1/4 (circulator flange)
not applicable
not applicable
not applicable
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
13 3/4
16 7/8
20
23 1/8
26 1/4
32 1/2
29 3/8
16 7/8
10 1/2
13 5/8
16 7/8
20
23 1/8
29 3/8
26 1/4
13 1/2
Supply “C” (inches)
(inches)
Number
WT-14
WT-14
WT-14
WT-14
WT-14
WT-20
WT-20
WT-20
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
Inlet & Outlet (NPT) (in)
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
Temp Control (NPT) (in)
Tankless Heater
1 1/4 (circulator flange)
1 1/4 (circulator flange)
1 1/2 (circulator flange)
1 1/2 (circulator flange)
Model** Heating
Net RatingS
Draft Loss Through Round (in.) Height (ft.) Approx. Shipping
(MBH) (2) (3)
(MBH) (3) (5)
Boiler (in w/c)
WTGO-3LR
98
75
WTGO-3RD
112
85
WTGO-4RD
140
107
WTGO-5RD
168
129
WTGO-6RD
196
150
WTGO-7RD
224
171
WTGO-8
322
231 (4)
WTGO-9
357
257 (4)
GPH (1)
Minimum Chimney Size
Weight (Lbs)
Rectangular (in.) ENERGY STAR*
WTGO-3L
133
99
WTGO-3
133
100
WTGO-4
168
126
WTGO-5
203
152
WTGO-6
245
184
WTGO-7
540
595
645
760
860
930
1,030
1,135
540
595
645
760
860
930
0.70
0.80
1.00
1.20
1.40
1.60
2.30
2.55
0.95
0.95
1.20
1.45
1.75
2.00
280
86
98
123
148
173
197
266
295
114
115
145
175
212
242
210
.010
.010
.010
.015
.015
.015
.025
.030
.010
.020
.010
.015
.015
.015
8X8
8X8
8X8
8X8
8X8
8X8
8X12
8X12
8X8
8X8
8X8
8X8
8X8
8X8
6
6
6
7
7
8
8
8
6
6
6
7
7
8
15
15
15
15
15
15
20
20
15
15
15
15
15
15
*
*
*
*
*
MBH (3) AFUE
86.4
87.0
87.0
87.0
87.0
87.0
-
-
85.0
85.3
85.0
85.0
85.0
85.0
Burner
Input
Rating
AHRI Certified Ratings
Capacity Tankless Heater
3.25
3.00
3.75
4.00
4.25
5.50
5.75
6.00
3.25
3.00
3.75
4.00
4.25
5.50
Draw Rating (6) Intermittent
WM1410_BRO_016_WTGO
RATINGS
Tappings
*
ENERGY STAR
®
compliant with Version 3.0 Boiler Specification of 87% AFUE only when installed at the
reduced burner rate (R) and with the optional vent damper kit (D). Burners shipped with standard rate
nozzle, reduced rates achieved through nozzle change-refer to burner instructions or boiler’s rating label
for correct selection.
*
In the interest of continual improvements in product and performance, Weil-McLain reserves
the right to change specifications without notice.