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Spa Volume (Gallons)
Model 200 300 400 500 600 700 800 900 1,000
MasterTemp’s easy-to-read
controls make system
operation and monitoring
simple. Pool and spa
temperatures can be
pre-set and controlled
with the push of a button.
A digital display indicates
the water temperature,
and five LED lights give
you system status and let
you know if the heater
needs service.
Easy to install or retrofit in even the tightest space — models
from 200M to 400M BTUs — all measure 21L x 21W x 28H
Rotating digital display means more installation options
and easier access to view operating information
Rustproof, tough composite exterior for long life
Available in natural gas and propane models.
Minutes for 30°F Temperature Rise (Heater Input in 1000 BTU/HR)
200 18.0 27.0 35.0 44.0 53.0 62.0 71.0 80.0 89.0
250/250HD 15.8 23.5 30.8 38.5 46.5 54.3 62.0 70.0 77.8
300 13.5 20.0 26.5 33.0 40.0 46.5 53.0 60.0 66.5
400/400HD 9.0 13.0 18.0 22.0 27.0 31.0 35.0 40.0 44.0
Pool Sizing
*
Spa Sizing
*
Note: The chart is based on a 30°F (55.6°C) temperature rise, discounting losses and only based on heat required to
raise temperature in minutes. Two-year limited warranty. See warranty for details.
°F
Temperature
Change/
24 Hrs.
Heater Size Heater Size
Model
200
Model
250/250HD
Model
300
Model
400/400HD
Model
200
Model
250/250HD
Model
300
Model
400/400HD
Pool Capacity in Gallons Pool Surface Area in Sq. Ft. at 5.5' Depth
5
10
15
20
25
30
35
40
97,383
48,691
32,461
24,346
19,477
16,230
13,912
12,173
121,729
60,864
40,576
30,433
24,346
20,288
17,390
15,216
146,075
73,037
48,692
36,519
29,216
24,345
20,868
18,260
194,766
97,383
64,922
48,691
38,953
32,461
27,824
24,346
2,364
1,182
788
591
473
394
338
295
2,955
1,478
985
739
591
493
423
369
3,546
1,773
1,182
887
710
591
507
443
4,727
2,364
1,576
1,182
945
788
675
591
*
ASME models available. See your Pentair Water Pool and Spa representative for details.