Hot Tub Weights and Measures

Great Northern® Hot Tubs  Traditional Round Cedar Hot Tubs Built With Premium Woods and High Tech Components

Main Website https://www.greatnorthernhottubs.com    Phone 763-566-3623    
OPUSPA™ FAMILY


(6" below top)
(6" below top) (Filled to top)
MAX Heating Times
 in F° / hr. Aprox.
STD. DEPTH 35"

WALL
 TYP. H2O DRY RATED MAX. MAX. H2O SPEC.LOAD 1.5kw 6.0kw 100K BTU
NOM. DIA. (FT) I.D.
DEPTH" DEPTH" WT. GALLONS GALLONS FILLED WT LBS./SQ.FT. 120V 240V Nat. Gas
3 33
35 29 75 107 130 1155 173 5.7 22.9 89.4
4 45
35 29 100 200 241 2109 175 3.1 12.3 48.1
5 57
35 29 125 320 387 3348 176 1.9 7.7 30.0
6 69
35 29 150 469 567 4873 177 1.3 5.2 20.4
7 81
35 29 175 647 781 6684 178 0.9 3.8 14.8
8 93
35 29 200 853 1029 8781 178 0.7 2.9 11.3
























Heating Times
RUBADUB TUB® FAMILY


(6" below top)
(6" below top) (Filled to top)
MAX
in F° / hr. Aprox.
STD. DEPTH 44"

WALL
 TYP. H2O DRY RATED MAX. MAX. H2O SPEC.LOAD 1.5kw 6.0kw 100K BTU
NOM. DIA. (FT) I.D.
DEPTH" DEPTH" WT. GALLONS GALLONS FILLED WT LBS./SQ.FT. 120V 240V Nat. Gas
3 33
44 38 102 141 163 1460 219 4.4 17.5 68.2
4 45
44 38 135 262 303 2661 221 2.3 9.4 36.7
5 57
44 38 170 420 486 4222 222 1.5 5.9 22.9
6 69
44 38 204 615 712 6142 223 1.0 4.0 15.6
7 81
44 38 238 848 982 8421 224 0.7 2.9 11.3
8 93
44 38 272 1117 1294 11059 225 NR 2.2 8.6
9 105
44 38 306 1424 1649 14057 225 NR 1.7 6.7
10 117
44 38 340 1769 2048 17413 225 NR 1.4 5.4
11 129
44 38 374 2150 2489 21129 226 NR 1.1 4.5
12 141
44 38 408 2569 2974 25204 226 NR 1.0 3.7












NR = Not Recommended

 

 











Heating Times
RUBADUB TUB® FAMILY - 54" DEPTH




(6" below top) (Filled to top)
MAX
in F° / hr. Aprox.
EXERCISE & MEDICAL THERAPY

WALL
 TYP. H2O DRY RATED MAX. MAX. H2O SPEC.LOAD 1.5kw 6.0kw 100K BTU
NOM. DIA. (FT) I.D.
DEPTH" DEPTH" WT. GALLONS GALLONS FILLED WT LBS./SQ.FT. 120V 240V Nat. Gas
3 33
54 48 125 178 200 1792 268 3.5 13.8 54.0
4 45
54 48 166 330 372 3265 271 1.9 7.4 29.0
5 57
54 48 209 530 597 5182 273 1.2 4.6 18.1
6 69
54 48 250 777 874 7538 274 0.8 3.2 12.3
7 81
54 48 292 1071 1205 10335 275 0.6 2.3 9.0
8 93
54 48 334 1412 1588 13573 276 NR 1.7 6.8
9 105
54 48 376 1799 2024 17251 276 NR 1.4 5.3
10 117
54 48 417 2234 2513 21371 277 NR 1.1 4.3
11 129
54 48 459 2716 3055 25931 277 NR 0.9 3.5
12 141
54 48 501 3245 3650 30932 277 NR 0.8 3.0












NR = Not Recommended









Heating Times
RUBADUB TUB® FAMILY - 60" DEPTH




(6" below top) (Filled to top)
MAX
in F° / hr. Aprox.
EXERCISE & MEDICAL THERAPY

WALL
 TYP. H2O DRY RATED MAX. MAX. H2O SPEC.LOAD 1.5kw 6.0kw 100K BTU
NOM. DIA. (FT) I.D.
DEPTH" DEPTH" WT. GALLONS GALLONS FILLED WT LBS./SQ.FT. 120V 240V Nat. Gas
3 33
60 54 139 200 222 1991 298 3.1 12.3 48.0
4 45
60 54 184 372 413 3628 301 1.7 6.6 25.8
5 57
60 54 232 597 663 5758 303 1.0 4.1 16.1
6 69
60 54 278 874 971 8375 305 0.7 2.8 11.0
7 81
60 54 325 1205 1338 11483 306 NR 2.0 8.0
8 93
60 54 371 1588 1764 15081 306 NR 1.5 6.0
9 105
60 54 417 2024 2249 19168 307 NR 1.2 4.7
10 117
60 54 464 2513 2793 23745 307 NR 1.0 3.8
11 129
60 54 510 3055 3395 28812 308 NR 0.8 3.1
12 141
60 54 556 3650 4056 34369 308 NR 0.7 2.6












NR = Not Recommended











Heating Times
RUBADUB TUB® FAMILY - 66" DEPTH




(6" below top) (Filled to top)
MAX
in F° / hr. Aprox.
EXERCISE & MEDICAL THERAPY

WALL
 TYP. H2O DRY RATED MAX. MAX. H2O SPEC.LOAD 1.5kw 6.0kw 100K BTU
NOM. DIA. (FT) I.D.
DEPTH" DEPTH" WT. GALLONS GALLONS FILLED WT LBS./SQ.FT. 120V 240V Nat. Gas
4 45
66 60 203 413 454 3991 331 1.5 5.9 23.2
5 57
66 60 255 663 729 6333 334 0.9 3.7 14.5
6 69
66 60 306 971 1068 9213 335 0.6 2.5 9.9
7 81
66 60 357 1338 1472 12631 336 NR 1.8 7.2
8 93
66 60 408 1764 1941 16589 337 NR 1.4 5.4
9 105
66 60 459 2249 2474 21085 338 NR 1.1 4.3
10 117
66 60 510 2793 3072 26120 338 NR 0.9 3.4
11 129
66 60 561 3395 3734 31693 339 NR 0.7 2.8
12 141
66 60 612 4056 4461 37806 339 NR 0.6 2.4












NR = Not Recommended











Heating Times
RUBADUB TUB® FAMILY - 72" DEPTH




(6" below top) (Filled to top)
MAX
in F° / hr. Aprox.
EXERCISE & MEDICAL THERAPY

WALL
 TYP. H2O DRY RATED MAX. MAX. H2O SPEC.LOAD 1.5kw 6.0kw 100K BTU
NOM. DIA. (FT) I.D.
DEPTH" DEPTH" WT. GALLONS GALLONS FILLED WT LBS./SQ.FT. 120V 240V Nat. Gas
4 45
72 66 221 454 496 4354 361 1.4 5.4 21.1
5 57
72 66 278 729 795 6909 364 0.8 3.4 13.2
6 69
72 66 334 1068 1165 10051 366 0.6 2.3 9.0
7 81
72 66 389 1472 1606 13780 367 NR 1.7 6.5
8 93
72 66 445 1941 2117 18097 368 NR 1.3 4.9
9 105
72 66 501 2474 2699 23002 368 NR 1.0 3.9
10 117
72 66 556 3072 3351 28494 369 NR 0.8 3.1
11 129
72 66 612 3734 4074 34574 369 NR 0.7 2.6
12 141
72 66 668 4461 4867 41243 370 NR 0.6 2.2












NR = Not Recommended