Installing the Water Heater 17
Note
Tighten the water heater connection valves with
care to avoid damage.
The gas connection fitting on all water heaters is
3
/
4
in.
1
/
2
in rigid pipe can be used; refer to the sizing
tables on the proceeding pages for limitations.
Avoid using
1
/
2
in corrugated connectors or tubing
as noise may occur.
Corrugated Connector
When using flexible gas lines, ensure that the
pipe’s inner diameter and connector is sufficient
to supply the required BTUs. Also, ensure that the
flexible line has no crimps or tight bends in it, as
this will restrict gas flow.
When using rigid pipe, Navien recommends the
installation of a union on the gas supply line
close to the water heater, to facilitate any future
maintenance or service.
CAUTION
Prior to using an excess flow valve (EFV) in the gas line, check
the manufacturer's minimum and maximum flow capacity
rating. An improperly sized EFV wil not allow for a full flow of
gas to the water heater and may cause improper operation.
CLOSE: 195
MAX OPER: 135
BYPASS: 5
KBTU
/HR
CLOSE: 195
MAX OPER: 135
BYPASS: 5
KBTU
/HR
Excess Flow Valve
Typical LP Gas piping examples:
2 Stage System with Multiple Regulators (Recommended)
Gas Regulators
(2 Stage)
Full size
Gas Pipe
Gas Tank
High Pressure
Regulator
Low Pressure
Regulator
Single Regulator System
Gas Regulator
12 in W.C.
Gas Tank
Full size
Gas Pipe
Full size
Gas Pipe
Pipe
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