Is it cheaper to leave immersion heater on all the time?
Olivia Shea
Updated on April 29, 2026
It’s better to leave the hot water heater on all the time, rather than turning it on and off. Your immersion heater or boiler will heat up hot water which is stored in a tank. As long as the tank has a good insulating jacket, it will keep the water hot all day, without needing to be constantly reheated.
Why do immersion heaters fail?
Failure of immersion heater elementsin a normally operating copper hot water storage tank may be caused by corrosion, or by development of an electrical defect. Frequent element failures at regular intervals occur in relatively few premises and these have particularly saline and/or scale forming water supplies.
How much does immersion cost per hour?
The cost of electricity is about 14p/kWh, which means that it would cost about 45p to run a 3kW immersion heater for an hour. Normally though, the immersion will turn on and off via the thermostat so the amount of time they are on fluctuates, depending on the existing temperature of the water in the hot water tank.
How long do immersion heaters last?
An immersion heater may last for between two and three years before it burns out and needs to be changed.
Can immersion rod be repaired?
Although some damage can be repaired/replaced there is a point where it makes more sense to replace the unit. Damaged electric heating elements, for example, are easily and affordably replaced. However, for more substantial or expensive repairs it may make sense to replace the entire heater.
What should my hot water tank thermostat be set at?
120 degrees Fahrenheit
The short answer: 120 degrees Fahrenheit. This is the preset thermostat temperature in most new water heaters, and it’s the recommended setting of the U.S. Department of Energy. At this temperature, harmful pathogens like the kind that cause Legionnaires’ disease are prevented from multiplying and may be killed.
What is the most efficient way to use an immersion heater?
Saving money with an immersion heater
- With a thermostat installed, immersion heaters can be efficient by turning off once the desired temperature has been reached.
- Timer controls allow you turn the immersion heater on and fit it around your routine and energy tariffs.
- Provides backup hot water if your boiler fails.
Why choose indindeeco flanged immersion heaters?
Indeeco flanged immersion heaters are one of the most widely used solutions for heating fluids and gases. Designed for use in tanks, pressure vessels, and in-line heating, flange heaters are easy to install and maintain.
Why choose indeeco comfort heaters?
Indeeco’s line of Comfort Heating Products cover a wide range of commercial and industrial applications. Whether the requirement is for architectural wall heaters, cabinet unit heaters, convector heaters or ceiling heaters, Indeeco has a product to match the application.
What is indindeeco tank heater used for?
Indeeco Tank Heaters are used to maintain or raise the temperature of gases and fluids in tanks from -300°F to 1000°F for a variety of applications and industries. These heaters are designed with low watt density, open coil heating elements for uniform heating of even the most temperature sensitive materials.
Why indindeeco process air heaters?
Indeeco Process Air Heaters are your solution for heating forced air in industrial systems efficiently and economically. Our reputation has been built on custom designed heaters where we control the complete design and manufacturing process.
