John Wood
Recovery Rate / Capacity Deficiency
John Wood gas water heater produces insufficient hot water; runs out quickly compared to normal
Advertisements
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Advertisements
Possible Causes
Thermostat set too low, Sediment buildup reducing effective capacity, Partially clogged dip tube, One heating element failed on electric model (if applicable)
How to Fix / Troubleshooting
Safety: For gas models, turn gas control to PILOT or OFF before draining. For electric models, turn off power at the breaker.
- 1. Check thermostat setting: Adjust the temperature dial slightly higher (within safe limits) and test hot water duration.
- 2. Flush sediment: Connect a hose to the drain valve, shut off cold supply, open a hot faucet, and drain several gallons until water runs clear. Sediment can significantly reduce capacity.
- 3. Inspect dip tube: Shut off water and relieve pressure. Remove the cold water inlet nipple and pull out the dip tube. Replace if it is cracked, shortened, or deteriorated.
- 4. Electric models: If you have a John Wood electric water heater, test both upper and lower elements and thermostats for continuity and proper operation. Replace failed components.
Advertisements
Repair Difficulty
Medium
3/5
Advertisements