18
Potable Water and Space Heating
1. All piping materials and components connected to
the water heater for the space heating application
shall be suitable for use with potable water.
2. Toxic chemicals, such as used for boiler treatment,
shall not be introduced into the potable water used
for space heating.
3. If the heater will be used to supply potable water,
it shall not be connected to any heating system or
components previously used with a non-potable
water heating appliance.
4. When the system requires water for space heating
at temperatures higher than 140°F, a means such
as a mixing valve shall be installed to temper the
water in order to reduce scald hazard potential.
CAUTION: When this heater is used for both
potable water and space heating, observe the follow-
ing to ensure proper operation.
Fig. 13: Single Domestic Hot Water Heater and Storage
Tank
Soft (0-4 grains per gallon) Medium (5-15 grains per gallon) Hard* (16-25 grains per gallon)
Model
No. Tgpm PMTS SHL Tgpm PMTS SHL Tgpm PMTS SHL
992A 28 60 2.7 2 4.6 20 83 5.2 2 8.6 13 132 13.1 2 21.0
1262A 30 72 4.4 2 7.0 20 106 9.6 2 14.8 16 132 14.8 2 22.7
1532A 30 86 7.1 2 10.7 20 132 16.5 2 24.4 20 132 16.5 2 24.4
1802A 30 101 10.7 2 15.5 23 132 18.3 2 26.1 23 132 18.3 2 26.1
2002A 30 112 13.9 2 19.7 26 132 19.0 2 26.9 26 132 19.0 2 26.9
2072A 30 116 14.8 2 21.0 27 132 19.0 2 26.9 27 132 19.0 2 26.9
2342A