lp-83 Rev. 006 Rel. 005 Date 12.18.17
7
PRODUCT LINE CONSISTS OF VARIOUS MODELS AVAILABLE IN
DIFFERENT SIZES
CALL THE FACTORY FOR PRODUCT AND WARRANTY INFORMATION
“DW” (Double Wall Commercial Heat Exchanger) Models are available
in 45, 60, 80, and 119 US Gallon Sizes.
“C” (Commercial) Models with Two Heat Exchangers for dual systems
and commercial applications. Use one coil for a wood boiler, the
other for a solar system, etc. Models available in 45, 60, 80, and 119
US Gallon Sizes.
DETERMINE THE AMOUNT OF DOMESTIC HOT WATER NEEDED. THEN
USE THE TABLE BELOW TO OPTIMIZE WATER HEATER AND BOILER
SIZING.
NOTE: FIRST DRAW AT 140
o
F AT 90
o
F Δ T. (FOR PERFORMANCE AT
115
o
F, MULTIPLY BY 1.56 FOR MINUTES OF WATER DRAW.)
LINE A GALLONS: LOW MASS BOILERS THAT TAKE LESS THAN 90
SECONDS TO HEAT TO TEMPERATURE.
LINE B GALLONS: HIGH MASS BOILERS THAT TAKE GREATER THAN 90
SECONDS TO HEAT TO TEMPERATURE.
MODEL
GROSS OUTPUT (x 1,000 BTU/HR)
40 60 84 100 120 140 160 180 200 220 240 260 280 300 320
SSU-20
A 73 112 152 -
B 53 81 110 -
SSU-30
A 83 125 160 193 -
B 60 90 115 140 -
SSU-30LB
A 84 128 166 213 -
B 60 92 120 154 -
SSU-45
A 94 138 180 210 242 -
B 68 100 130 152 175 -
SSU-60
A - 221 244 251 258 266 287 305 -
B - 160 176 181 186 192 207 220 -
SSU-80
A - 297 305 314 367 424 489 503 -
B - 216 223 230 269 311 359 370 -
SSU-119
A - 333 384 444 457 470 543 627 645
B - 216 251 290 335 345 399 460 474
C. Reduced Boiler Input Sizing Guide
NOTE: IT IS NOT RECOMMENDED TO REDUCE BOILER INPUT WHEN USING DOUBLE WALL TANKS.
Table 4 - Describes Cold Start First Hour Ratings (A and B) and Boiler Size
MODEL 2 GPM 2.5 GPM 3 GPM 3.5 GPM 4 GPM 4.5 GPM 5 GPM
SSU-20
A 9.5 8 7 5.5 4.5 4 3.5
B 8.5 7.5 6.5 5 4 3.5 3
SSU-30
A 16 13 10 7.5 6 5.5 5
B 14 12 9 7 5.5 5 4.5
SSU-30LB
A 18 14 12 9 6.5 6 5.5
B 17 12 10 8 6 5.5 5
SSU-45
A 23 18 14 11 8.5 7.5 7
B 18 15 13 10 7.5 7.5 6.5
SSU-45C
A ∞ ∞ ∞ 29 20 17 14
B 45 24 26 18 16 13 10
SSU-60
A
∞ ∞ ∞ ∞
36 30 22
B 29 19 12
SSU-60C
A
∞ ∞ ∞ ∞ ∞
46 29
B 30 21
SSU-80 A B ∞ ∞ ∞ ∞ ∞ ∞ ∞
SSU-80C A B ∞ ∞ ∞ ∞ ∞ ∞ ∞
SSU-119 A B ∞ ∞ ∞ ∞ ∞ ∞ ∞
SSU-119C A B ∞ ∞ ∞ ∞ ∞ ∞ ∞
Table 5 - NOTE: THIS INFORMATION IS BASED ON BOILER SIZE CONFORMING TO THE MINIMUM BTU/H REQUIRED TO ACHIEVE FIRST HOUR RATINGS,
OBTAINABLE FROM FIRST HOUR RATING TABLE. ∞ - Indicates continuous duty.
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