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Requires 120V 60Hz, maximum inlet gas pressure of 14" W.C. and activation of heater by an external temperature control. OPTIONAL POWER VENT KIT - For sidewall venting. WORKING PRESSURE - ASME approved, hydrostatically tested and certified for 160 psi (1100 kPa). * Model HW-399: 81% efficiency, Model HW-610: 80% efficiency. COMMERCIAL BOILERS HW-300 THRU HW-610 Domestic Hot Water Supply Not approved for instantaneous applications. FOR UNITS BUILT FOR U.S.A. FOR UNITS BUILT FOR CANADA HW MODELS CERTIFICATION & APPROVAL LIMITED WARRANTY OUTLINE If the heat exchanger modules should fail within 5 years, under the terms of the warranty; A.O. Smith will furnish a replacement part; installation, labor, handling and local delivery extra. THIS OUTLINE IS NOI A WARRANTY. For complete information, consult the written warranty or A.O. Smith Water Products Company. Revised December 1996 ——----- NOTE: TOP MANIFOLD HAS EXTRA OPENINGS FOR THERMOMETER 3/4“ (19MM) AND RELIEF VALVE 1“ (25MM) [HW-520 AND -610 ONLY] HW - 300 ONLY HW-610 NATURAL GAS ONLY ALL DIMENSIONS IN INCHES (MM) Models A В С D E F G H J К L M N P Q R S T Approx. Ship. Wt. Lbs. (Kgs.) HW-300 65 (1651) 43-1/4 (1099) 36 (914) 25-1/4 (641) 12 (305) 8 (203) 16-1/2 (419) 29-5/8 (753) 9 (229) 14 (356) 1-1/4 (32) 1-1/4 (32) 3/4 (19) 26-5/8 (676) 1 (25) 10-1/8 (257) 5-3/8 (137) 5 (127) 240 (109) HW-399 57-1/8 (1451) 45-1/8 (1146) 38-3/4 (984) 27 (686) 12 (305) 10 (254) 16-3/4 (425) 31-1/2 (800) 9 (229) 14 (356) 1-1/2 (38) 1-1/2 (38) 1 (25) 27-1/2 (699) 1 (25) 11-1/4 (286) 5-1/2 (140) 5 (127) 291 (132) HW-420 57-1/8 (1451) 45-1/8 (1146) 38-3/4 (984) 27 (686) 12 (305) 10 (254) 16-3/4 (425) 31-1/2 (800) 9 (229) 14 (356) 1-1/2 (38) 1-1/2 (38) 1 (25) 27-1/2 (699) 1 (25) 11-1/4 (286) 5-1/2 (140) 5 (127) 291 (132) HW-520 68-5/16 (1735) 56-1/4 (1429) 46 (1168) 27 (686) 12 (305) 10 (254) 18 (457) 36-1/2 (927) 9 (229) 11 (279) 2 (51) 2 (51) 1 (25) 24-1/2 (622) 3-1/2 (89) 12 (305) 5-3/4 i146) 7 (178) 361 (164) Propane HW-610 67 (1702) 56-1/4 (1429) 46 (1168) 27 (686) 12 (305) 12 (305) 18 (457) 36-1/2 (927) 9 (229) 11 (279) 2 (51) 2 (51) 1 (25) 24-1/2 (622) 3-1/2 (89) 12 (305) 5-3/4 (146) 7 (178) 361 (164) Natural HW-610 64-3/4 (1645) 56-1/4 (1429) 46 (1168) 27 (686) 12 (305) 12 (305) 18 (457) 36-1/2 (927) 9 (229) 11 (279) 2 (51) 2 (51) 1 (25) 24-1/2 (622) 3-1/2 (89) 12 (305) 5-3/4 (146) 7 (178) 361 (164) SPECIFICATIONS AND RECOVERY CAPACITIES TEMPERATURE RISE INPUT Temp. (C) 11 17 22 26 33 39 44 50 56 61 67 72 78 Model BTUH (KW) Rise (F) 20 30 40 50 60 70 80 90 100 110 120 130 140 HW-300 300,000 LPH 5,505 3,670 2,753 2,202 1,835 1,573 1,376 1,223 1,001 1,001 918 847 786 (88) GPH 1,455 970 727 582 485 416 364 323 291 264 242 224 20B HW-399 399,000 LPH 7,322 4,882 3,661 2,929 2,441 2,092 1,831 1,627 1,464 1,331 1,220 1,127 1,046 (116) GPH 1,935 1,290 967 774 645 553 484 430 387 352 322 298 276 HW-420 420,000 LPH 7,708 5,138 3,854 3,083 2,569 2,202 1,927 1,713 1,542 1,401 1,285 1,186 1...

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