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- Temperature/ Pressure Valve (TP Valve). Safety device to prevent the tank from exploding should the pressure exceed limits.
- Hot water out.
- Electric heating elements. Each may have its own thermostat, or could be both controlled by a single thermostat.
- Cold water in & shut off valve.
- Drain Valve.
- Exhaust vent for combustion flumes, piped to the outside.
- Thermostat control / shut off & pilot light control.
- Gas Burner.
- Expansion Tank.
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