How Does a Hot Tub Heater Work?

hot tub heater

Are you curious about how a hot tub works, especially the heater?

There are various hot tub types, but one thing that they all have in common is their built-in heater. This attribute makes a hot tub a truly luxurious and pleasant form of relaxation.

Fortunately, the functionality of a hot tub is rather simple and easy to comprehend. If you want to learn more about the inner workings of a hot tub heater, just keep on reading.


Hot tub heaters are an essential component that allows users to enjoy the warmth of their hot tub no matter the temperature outside. The components of a hot tube heater replacement include a heat exchanger, a thermostat, a timer, and a pump.

It does this by using radiant heat, convection, or a combination of the two. The thermostat is used to set the desired temperature that the user would like their spa to reach. If you’re interested in hot tub heaters for sale, check Pool Store Canada.

Electrical Resistance Heaters

An electrical resistance hot tub heater works by converting electrical energy into heat energy. When power is applied to a heater element, the element becomes electrically charged and produces a magnetic field.

As the current passes through the element, the resistance causes the element to heat up. This heats up the liquid in the hot tub, creating a warm and relaxing atmosphere for heated hot tub users.

Heating the Water

Hot tub heaters are an important part of keeping a hot tub at the desired temperature and providing enjoyable hydrotherapy. The way a hot tub heater works is it pumps water from the spa through a filter and into a heater, where it is heated to the temperature you set.

Most hot tub heaters are powered by electric coils and some use natural gas, propane, or fuel oil to heat the water. Although the technology and the manner of heating have varied over the years, all of them work by transferring heat from a heat source to the hot tub water.

Jetting the Water

A hot tub heater works by jetting hot water out of jets located in the walls of the hot tub. This is typically done by a recirculating pump, which draws in cooler water from the tub, then passes it through a heating element like a coil or a heat exchanger.

The heated water is then pushed back into the hot tub through the jets, causing the water to bubble. This bubbling action, which creates a massage-like effect, helps to relax and refresh the bathers.

The Drip Cap

A hot tub heater with a drip cap is designed to protect against water damage, rust, and corrosion through an enclosed design. The drip cap works by preventing water from entering and accumulating inside the heater.

This is done by collecting minor splashes of water at the top of the heater and then gently dripping down the sides of the heater away from the electric components of the heater. It also protects against condensation buildup, which can add to rust and corrosion occurring inside the heater.

Discover How a Hot Tub Heater Works

Hot tub heaters are complex yet simplistic components that reliably warm your spa and keep your water at just the right temperature.

Learning how these heaters operate provides reassurance and an understanding of their efficiency. To benefit from a hot tub heater for years to come, reach out to an experienced spa retailer today for guidance and advice.

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