John Wood Water Heater

Questions and Answers

T
Tyler SinghJul 30, 2025
Why is there insufficient hot water from my John Wood Water Heater?
- S
  schavezJul 30, 2025
  Insufficient hot water from your John Wood water heater can stem from several causes. The thermostat might be set too low; turn the temperature dial to the desired setting. Sediment or lime accumulation in the tank can also be a factor; drain and flush the tank, and consider water treatment if needed. Other potential causes include the water heater being too small (install an adequate size heater), incorrect piping connections (correct the piping—the dip tube must be in the cold inlet), leaking faucets (repair faucets), wasted hot water (advise customer to conserve), long runs of exposed piping (insulate the piping), hot water piping in an outside wall (insulate the piping), or low gas pressure (check with the gas utility company).
S
Sharon SanchezAug 3, 2025
Why is my John Wood Water Heater's hot water recovery so slow?
- D
  Donna FowlerAug 4, 2025
  Slow hot water recovery in your John Wood water heater can be due to several reasons. Insufficient secondary air can cause this issue, so ensure proper ventilation to the water heater and check the flue way, flue baffle, and burner. A clogged flue can also be the culprit; clean the flue and locate and correct the source. Other potential causes include low gas pressure (check with the gas utility company), the gas control/thermostat set too low (turn the temperature dial to the desired setting), the water heater being too small (install an adequate size heater), wrong piping connections (correct piping—the dip tube must be in the cold inlet), or wasted hot water (advise the customer to conserve).
A
ashley47Aug 8, 2025
What to do if the burner flame is yellow and lazy on my John Wood Water Heater?
- R
  Robert GuerraAug 8, 2025
  A yellow and lazy burner flame on your John Wood water heater may be caused by several factors. Insufficient secondary air could be the issue, so ensure proper ventilation to the water heater. Low gas pressure can also cause this problem; check with your gas utility company. Other potential causes include a clogged flue or main burner line (clean, locate the source, and correct), the heater being installed in a confined area (ensure proper fresh air ventilation), or an obstruction in the main burner orifice (clean or replace the orifice).
K
Kristin YoungAug 12, 2025
Why is the pilot flame too small on my John Wood Water Heater?
- J
  Jeffrey PhillipsAug 12, 2025
  A small pilot flame on your John Wood water heater can be attributed to a few reasons. The pilot line or orifice might be clogged; in this case, clean it and locate and correct the source. Another possibility is low gas pressure; check with your gas utility company. Finally, the pilot itself may be defective, requiring replacement.
B
Bryan BrownAug 17, 2025
What causes the burner flame to lift off ports on a John Wood ?
- S
  Shannon DavidsonAug 17, 2025
  If the burner flame lifts off the ports on your John Wood water heater, it could be due to high gas pressure (check the input rate with orifice size) or air contamination (check the combustion air quality).
E
Edwin BarberAug 21, 2025
Why is the burner flame too high on my John Wood Water Heater?
- G
  ginarobersonAug 21, 2025
  If the burner flame is too high on your John Wood water heater, the orifice may be too large. Replace it with the correct orifice.
L
Lauren VillaOct 25, 2025
How to fix a John Wood Water Heater when the burner will not ignite?
- J
  Jonathan VangOct 25, 2025
  If the burner on your John Wood water heater (24V controls only) won't ignite, several factors could be responsible. First, ensure the unit is receiving power by checking the power cord, fuses, and supply voltage. Also, make sure the thermostat isn't set too low; if it is, increase the thermostat temperature setting. Other potential causes include a defective flue damper (replace the flue damper), disconnected or loose wires (repair or reconnect the wires), control lock-out (reset and determine the cause of the lockout), no gas (check with the gas utility company), dirt in the pilot or gas line (notify the gas utility), a plugged pilot or burner orifice (clean and correct the source), a defective igniter (replace the igniter), or the heater being installed in a confined area (provide more ...

Summary

Safety Information

Installation Codes and Standards

Specifies installation codes for Canada and the United States.

Key Safety Warnings

Addresses risks of flammable vapours, scalding, carbon monoxide, and relief valves.

Installation Guide

Unpacking and Location Requirements

Guides on unpacking, moving, and selecting an installation location.

Clearances and Accessibility

Specifies minimum clearances for safe access and service.

Gas Supply

Covers gas supply connection and pipe sizing.

Gas Pressure, Purging, and Leak Testing

Details gas pressure, line purging, and leak testing procedures.

Air Requirements

Explains the need for adequate combustion and ventilation air.

Confined Space Air Requirements (Canada)

Details air supply needs for Canadian installations in confined spaces.

Confined Space Air Requirements (U.S.)

Details air supply needs for U.S. installations in confined spaces.

Exhaust Venting and Drafthood

Covers vent pipe system, sizing, and drafthood installation.

Water Supply and Piping Installation

Outlines water supply connection and piping requirements.

Mixing Valves and Closed System Expansion

Discusses mixing valves and thermal expansion in closed water systems.

T&P Relief Valve and Discharge Line

Details T&P relief valve testing and discharge line requirements.

Electrical Supply and 24 Volt Controls

Covers electrical connection safety and 24V control precautions.

Operating Instructions

Water Temperature Regulation and Scald Risk

Discusses safe hot water temperatures and scald risks.

Temperature Adjustment

Explains how to adjust the thermostat for desired temperature.

Lighting Instructions (White-Rodgers 37 C)

Step-by-step guide for lighting the pilot on White-Rodgers controls.

Lighting Instructions (Honeywell 24 Volt)

Step-by-step guide for lighting the pilot on Honeywell 24V controls.

Operation Details

Burner Flames and Checking the Draft

How to inspect burner flames and check the vent draft.

Operating Conditions and Condensation

Explains normal condensation and its causes during operation.

Water Heater Sounds and Safety Shut-off

Common operational sounds and automatic safety shutdown features.

Anode;Water Odour and 24 V Operation

Addresses water odour issues and the operation sequence for 24V models.

System Error Codes for 24 Volt Controls

Lists and explains system status and error codes for 24V controls.

Maintenance Procedures

Periodic Cleaning and Flushing

Procedures for cleaning filters and draining/flushing the tank.

Periodic Inspection and Flame-arrestor Cleaning

Guidance on regular inspections and cleaning the flame arrestor.

T&P Relief Valve Test and TCO Switch Reset

How to test the T&P valve and reset the TCO switch (NG models).

Thermocouple Replacement (LP)

Instructions for replacing the thermocouple assembly on LP models.

24 Volt Control Module and Valve Replacement

Guides for replacing electronic control and valve modules for 24V systems.

Temperature Sensor and Cable Replacement

Steps for replacing the temperature sensor and cable.

Combo Heating and Troubleshooting

Combo Heating System Requirements

Outlines requirements for installing combo heating systems.

Troubleshooting Guide

Provides solutions for common problems like no ignition, poor flame, and insufficient hot water.

Repair Parts and Warranty

Repair Parts Illustration

Illustrates and lists replacement parts for various water heater models.

Limited Warranty Information

Details warranty coverage, exclusions, and claim procedures.