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Selection Chart for Water Heaters Without Storage Tanks but with Forced Return Line Circulating Pump

*Usage adjustment factors - heaters deliver required BTUs over 3-hour period.

  • System without return circulation.........multiply # of apts. by 1.2
  • Apartments with 1 1/2 baths.........multiply # of apts. by 1.2
  • Apartments with 2 baths........multiply # of apts. by 1.3
  • Apartments with one whirlpool bath........multiply # of apts. by 1.25
  • Apartments with individual washing machines........multiply # of apts. by 1.2

Number of
Units
2-3 GPM
40 Inlet
2-3 GPM
60 Inlet
4-5 GPM
40 Inlet
4-5 GPM
60 Inlet
< 4 75T75 75T75 75T75 75T75
4-6 75T75 75T75 75T125 75T125
7-8 75T125 75T125 75T125 75T125
9-10 80T180 80T180 80T180 80T180
11-15 80T199 80T180 80T199 80T180
16-20 (2) 75T125
Or
(1) 80T250
80T250 (2) 80T180
Or
(1) 68T370
(2) 80T199
Or
(1) 80T399
21-30 (2) 80T199
Or
(1) 80L399
(2) 80T180
Or
(1) 65T370
(2) 80T250
Or
(1) 80L505
(2) 80T180
Or
(1) 80L505
31-40 (2) 100T199
Or
(1) 80L505
(2) 80L180
Or
(1) 80L399
(3) 80T180
Or
(2) 65T370
(2) 100T199
Or
(1) 80L505
41-50 (3) 80T180
Or
(1) 80L505
(2) 80T180
Or
(2) 80L360
(2) 80T250
Or
(1) 80L505
(2) 80T180
Or
(1) 80L505
51-75 (3) 100T199
Or
(1) 80T725
(3) 80T 180
Or
(1) 80L505
(2) 80L505
Or
(3) 65T370
(2) 65T370
Or
(3) 100T199
76-100 (2) 80L399 (2) 80T199
Or
(2) 75T300
(2) 80T725
Or
(3) 80L399
(3) 75T 300
Or
(2) 80L505

When more than one correction factor is applicable, add the decimal portion of the individual factors to 1 and multiply the new total by the number of units.



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