Table of Contents
Advertisement
TANKLESS WATER HEATER
WARNING
To avoid serious injury or death, the gas line installation and the gas line inlet pressure test must be
done by a licensed professional. Always match the water heater with the type of gas supplied to the
unit (natural gas or LP gas). This water heater must be converted into propane operation unless
specifically manufactured for use with propane. Follow Gas Conversion Manual instructions (separate
document). Propane ready water heaters have the suffix "LP" after the model serial number.
Make sure the gas line pressures are within normal limits. Pressures outside normal limits can result in
poor performance and hazardous operating conditions.
This water heater must be converted into propane operation unless it is specifically manufactured to
operate on propane. Propane- ready water heaters have the suffix "LP" after the model serial number.
Failure to ensure the water heater is set to operate on the provided gas supply could result in property
damage, personal injury, or death.
A. GAS PIPE SIZING TABLES
1. Gas Pipe Sizing
This information is for reference use only. Refer to gas pipe manufacturer specifications for actual delivery
capacity. The DOE standard for Natural Gas is 1100 BTU/ft3. Contact the local gas supplier for actual BTU/ft3
rating.
2. Natural Gas Pipe Sizing
The following tables list maximum capacity of pipe in cubic feet of gas per hour for gas pressures of 14" or
less and a pressure drop of 0.5 inches water column, based on a 0.60 specific gravity for natural gas.
Pipe
Size
1/2"
3/4"
1"
1
1/4"
1
1/2"
1260
2"
2930
Table 11 – Natural Gas Delivery Capacity – Corrugated Stainless Steel Pipe – Refer to ANSI Z223.1 – Na-
tional Fuel Gas Code, Latest Edition.
32
Maximum Natural Gas Delivery Capacity - Length of Corrugated Stainless Steel Pipe in Feet
Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC Pressure Drop)
10
20
30
82
58
47
192
137
112
383
269
218
639
456
374
888
723
2080
1700
Gas Piping
FIRE AND/OR EXPLOSION HAZARD
40
50
60
41
37
37
97
87
80
188
168
153
325
292
267
625
559
509
1470
1320
1200
PART 7
80
100
150
29
26
20
69
62
48
132
118
91
232
208
171
440
393
320
1200
933
762
200
18
44
82
148
277
661
Advertisement
Table of Contents
