Question: How Does A Dual Thermostat Water Heater Work?

Can you replace the thermostat on a water heater?

Most electric water heaters made today use a dual element system.

For each element, the unit requires a matching thermostat, so dual element units have two thermostats, and single element models only one.

When replacing one thermostat, it is a good idea to go ahead and replace both the upper and lower thermostats..

How much does it cost to replace a water heater thermostat?

The average thermostat replacement cost is between $100 and $300. Most other repairs are equally affordable. There are two main types: gas and electric. A gas unit works by way of a gas flame while an electric one works using electric elements, or coils.

What causes a water heater thermostat to burn up?

A shorted heating element—It may be that the thermostat is working just fine and shutting off the heating element. But a short in the element is causing it to continue to heat your water. Loose wiring—A loose wire in the water heater can generate heat that can cause the high-limit switch to trip.

What happens if you leave immersion on?

“The main problem with leaving an immersion on constantly is that the immersion thermostat will be constantly switching on and off. After so many hours the thermostat will give up, causing one of two problems.”

Where is the thermostat in a water heater?

Adjusting water heater temperature Fortunately, most water heater types are adjusted similarly. For instance, most newer gas and electric water heaters have a thermostat behind an insulated access panel. Electric water heaters often have two thermostats — one at the top and another at the bottom of the tank.

Do both hot water heater elements come on at the same time?

If you use all the hot water in the tank, the upper thermostat will demand heat and withdraw power from the bottom of the tank. Non-simultaneous means that only one of the heating elements may heat at a time. NEVER turn on power to the water heater unless it is full of water and has been purged from a hot water faucet.

How does a dual element immersion heater work?

With two-element designs, one element heats the water at the top of the tank while the second element heats the water within the bottom of the tank. Electric heaters feature fewer parts than gas models, but a basic understanding of how two-element models function can reduce the time needed to diagnose a problem.

Why does my hot water heater have 2 thermostats?

A dual-element water heater uses two heating elements controlled by two separate thermostats. … When it reaches a specified temperature, it shuts off, and the lower heating element takes over, heating the rest of the water. This is an efficient, money-saving feature, as the water is heated in a consistent manner.

Why do I have 2 immersion heaters?

Bottom immersion should run on E7, heats the whole tank on cheap rate electricity. The 2nd one is a ‘Boost’, if you run short on hotwater during the day it heats the top half of the tank on normal rate electricity. Best leaving bottom (cheap rate) on, it’ll come on to heat the water overnight on E7.

How do I troubleshoot my electric water heater thermostat?

How to Troubleshoot a Defective Thermostat on An Electric Water HeaterHead to the circuit breaker and turn off the power to the thermostat. … Pull out the two panels that protect the thermostat. … Locate a plastic panel on the thermostat and heating element. … Check for a “snapping” movement as you push the button.More items…

How does thermostat work on water heater?

The thermostat is a thermistor that responds to heat by producing a small electric current. The current increases when water temperature increases, and drops when temperature drops. Changes in the electric current cause gas control to turn ON and OFF. When gas control turns ON, it releases gas to burner.

Which element heats first on water heater?

The upper thermostat first sends electrical energy to the upper element until the water temperature in the upper third of the tank reaches the thermostat setting. Power is then transferred to the lower element until the remaining water reaches the lower thermostat setting.

How do I know if I dry fired my hot water heater?

What is a Dry-Fired element?The zinc plating will have melted or completely burned off, leaving exposed copper.The tubing of the element will be completely annealed (soft) to a point that it can be easily bent in the straight sections of the tube.The terminal block may show signs of melting at the base next to the screw plug.

How do you know when your water heater needs replacing?

5 Signs You Need a New Water HeaterAn Old Unit. If your water heater is older, you can find its exact age by looking for the serial number on the manufacturer’s sticker near its top. … Rusty Water. If your hot water is rusty, your water heater could be rusting on the inside, and it might start leaking soon. … Not Enough Hot Water. … Rumbling and Noise. … Leaks.

What happens when a heating element goes out in a water heater?

When an electric hot water heater’s elements short out or burn through, cool water is the result. Typically, the lower element goes first, but that’s not always the case. Fortunately, a few quick electrical tests reveal which element you must replace in order to restore hot water to your home.

How do you know if the thermostat is bad in a water heater?

Usually, when the upper thermostat goes bad, you will have no hot water at all, while a bad lower thermostat makes itself known when there is only a small amount of hot water before the tap water goes cold.