Category Archives: Glossary

Learn about all the different parts of many types of water heaters with our Water Heater Glossary.

What Is a Dielectric Nipple?

Dielectric Nipple

A Dielectric Nipple is used to help prevent corrosion of the steel tank of the water heater caused by galvanic corrosion when dissimilar metals such as copper are used for pipes connecting to the water heater. Galvanic corrosion can occur when two different metals contact each other in an electrolyte solution. Metals are ranked on a nobility scale and the further apart the two metals […]

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What Is A Heat Trap?

heat-trap-nipples

A Heat Trap is a device or, method of piping used to limit the loss of heat from a water heater by convection or, thermosyphoning up through the pipes entering or leaving the water heater. Many codes require the installation of heat traps to save on energy costs. The most common method used is to install heat trap nipples on the inlet and outlet of […]

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What is an Anode Rod?

ANODE

An Anode Rod is a device used to provide corrosion protection for the steel tank of a water heater. The corrosion that occurs in a water heater is caused by Galvanic Corrosion in which the water becomes the electrolyte and electrons flow from the anode to the cathode depleting the metal until a hole in the tank is formed. There are two basic types of […]

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What Is A Thermo Coupling?

Thermocouple

A Thermo Coupling is a device that has two metals joined together that generate a low voltage when they are heated. In a gas water heater the Thermo Coupling is a critical safety device that detects a flame present at the pilot light of the burner and holds the gas valve open allowing the pilot light to stay lit and the burner of the gas […]

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What is a T&P Valve?

T and P Valve

A T&P Valve is a very important safety device used on water heaters. The T&P is the last safety device before a water heater explodes so it is very important that the T&P Valve is operating correctly, tested often, and never defeated by plugging it even when it is leaking. A Properly functioning T&P Valve should not leak while the water heater is operating at […]

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What Is A Water Heater Pilot Light?

pilot-lights

A Pilot Light in a water heater is a small flame which is used to ignite the larger flame of the main burner used to heat the water in the water heater. The Pilot Light is a small burner separate from the main burner that only uses a small amount of gas to provide a flame that in many cases stays lighted all the time […]

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