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Index
Index
1Warning 2
2 Appliance details 4
2.1 Features 4
2.2 GWH-345/450-ESR Specifications (Technical data) 4
2.3 Unpacking the GWH-345/450-ESR heater 5
2.4 General rules to follow for safe operation 6
2.5 Dimensions and minimum installation clearances 7
2.6 Applications 8
2.7 Water quality 9
3 Installation instructions 10
3.1 Introduction 10
3.2 Proper location for installing your heater 10
3.3 Heater placement and clearances 10
3.4 Mounting installation 10
3.5 Combustion air requirements 11
3.6 Venting 13
3.6.1 Vent material and specifications 13
3.6.2 Vent connections and air inlet restrictors 14
3.6.3 Condensate drain requirements 17
3.6.4 Room sealed installation (Twin pipe) 17
3.6.5 Vertical terminations 18
3.6.6 Horizontal terminations 18
3.6.7 Exhaust vent configuration examples 21
3.7 Gas piping & connections 22
3.8 Measuring gas pressure 24
3.9
Checking restrictor plate size by measuring CO
2
level value 24
3.10 Water connections 25
3.11 Electrical connections 25
4 Operating instructions 27
4.1 Initial filling instructions 27
4.2 For your safety read before operating your water heater 27
4.3 Startup instructions 27
4.4 Power 28
4.5 Recirculating water temperature 28
4.6 Temperature and hot water flow 28
4.7 Freeze protection 28
4.8 Electrical diagram 29
5 Maintenance and service 30
5.1 Service mode 30
6 Troubleshooting 32
7 GWH-345/450-ESR Functional scheme 34
8 Interior components diagram and parts list 35
8.1 Interior components 35
8.2 Components diagram 36
8.3 Parts list 37
9 Protecting the environment 38
10 Ten Year Limited Warranty 39
1 Warning
For your safety
Do not store or use gasoline or other flammable,
combustible or corrosive vapors and liquids in the
vicinity of this or any other appliance.
Warning: Carefully plan where you
install the heater. Correct combustion
air supply and flue pipe installation are
very important. If a gas appliance is not
installed correctly, fatal accidents can
result from lack of air, carbon monoxide
poisoning or fire.
Warning: Exhaust gas must be vented
to outside using 3" single wall sealed
stainless steel vent pipe suitable for
category III vent systems and
temperatures up to 480°F. Vent and
combustion air connector piping must
be sealed gas-tight to prevent
possibility of flue gas spillage, carbon
monoxide emissions and risk of fire,
resulting in severe personal injury or
death.
Warning: Place the recirculating water
heater in a location where water leaks
will do NOT DAMAGE adjacent areas
or lower floors.
Warning: Field wiring connections and
electrical grounding must comply with
local codes, or in the absence of local
codes, with the latest edition of the
National Electric Code, ANSI/NFPA 70,
or in Canada, all electrical wiring must
comply with the local codes and the
Canadian Electrical Code, CSA C22.1
Part 1.
Warning: Shock hazard line voltage is
present. Before servicing the
recirculating water heater, turn off the
electrical power to the recirculating
water heater at the main disconnect or
circuit breaker. Failure to do so could
result in severe personal injury or death.