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Fig. 12: Single Domestic Hot Water Heater and
Storage Tank
Potable Water and Space Heating
CAUTION: When this heater is used for both potable
water and space heating, observe the following to en-
sure proper operation.
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.
Soft (0-4 grains per gallon)
Model
No.
∆
∆
T gpm
P MTS SHL
503
17
50
3.6
753
26
50
4.0
1003
30
58
6.0 2-1/2
1253
30
73
10.4 2-1/2 12.1
1503
30
87
16.0 2-1/2 18.5
1753
30
102 22.7 2-1/2 26.0
2003
30
116 32.0 2-1/2 36.1
∆T = Temperature rise, °F
∆P = Pressure drop through heat exchanger, ft
SHL = System head loss, ft (based on heater and tank placed no more than 5 ft apart and equivalent length of 25 ft of tubing)
gpm = Gallons per minute, flow rate
MTS = Minimum tubing size
* Must use optional cupro-nickel tubes. If over 20 grains per gallon, a water softening system must also be used.
Medium (5-15 grains per gallon)
∆
gpm
T
2
5.9
17
50
2
6.3
20
65
7.2
20
87
20
109
23
113
27
113
30
116
Table G: Domestic Water Heater Flow Rate Requirements
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.
Pool Heating
When a boiler or water heater is used in a pool heating
application, ensure that all the following installation
requirements are met.
CAUTION: Power to the heater should be interlocked
with the main system pump to ensure the heater does
not fire without the main system pump in operation.
Improper flow control can damage the heater. Uncon-
trolled flow (too high) or restricted flow (too low) can
seriously damage the heater. Follow these instructions
to make sure your heater is properly installed.
The MVB must be equipped with a field-supplied ex-
ternal pump and bypass arrangement. This arrangement
blends outlet water with the inlet water to increase the
inlet water temperature to a minimum of 120°F,
thereby reducing the likelihood of condensation form-
ing on the heat exchanger. The pump also serves to
circulate water through the heater from the main sys-
tem piping.
Hard* (16-20 grains per gallon)
∆
∆
MTS
SHL
P
T
3.6
2
5.9
9
6.4
2
10.2
13
12.0
2-1/2
14.4
15
21.0
2-1/2
24.6
19
25.7
2-1/2
29.6
23
27.4
2-1/2
31.3
27
32.0
2-1/2
36.1
30
15
SECTION C: Installation
∆
gpm
MTS
SHL
P
95
10.4
2
18.1
100
13.8
2
22.2
113
18.7
2-1/2
22.6
113
22.3
2-1/2
26.3
113
25.7
2-1/2
29.6
113
27.4
2-1/2
31.3
116
32.0
2-1/2
36.1
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