Hot Tub Heaters

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Hot Tub Heaters

Terminology

Usually, if a spa heater needs to be replaced, then the whole "spa heater" is replaced.

Sometimes, a tech will replace just the "heater element". That is the coil inside the heater tube and does not include the Manifold (heater tube) itself.

Replacing just the heater element is not advised because it is hard to get the epoxy seal to be 100% correct and also to align the element inside so it does not touch the inner walls of the heater manifold. A pro will not have an issue replacing an element, but if the heater is more than a few years old, it is best to replace the entire spa heater.

What's an M7 Heater?

That is a heater type spearheaded by Balboa Instruments and later BWG or Balboa Water Group that incorporates 2 M7 sensors inside the tube. These 2 sensors work together to establish safe operating conditions and report temperature, overlimit issues and other measurements back to the circuit board.

Standard, non-M7 heaters usually operate with an external pressure switch. This switch can either be mounted to the heater or in a separate plumbing piece next to the heater. It is a good idea to replace the pressure switch when replacing the heater.

Sensors are either built into the heater, or they can be external. For instance, a temperature sensor may be mounted to a thermowell (dry or wet) in the spa and take the water temperature measurement while the hi-limit sensor will usually be clipped to the spa heater to assure the heater tube does not reach excessive temperatures.

There are other configurations of heaters and sensors, but these are some of the most common.

 

Contact us with questions about finding the right heater or sensor for your spa.

Spa Heaters

Buy hot tub replacement parts onilne.

Jacuzzi hot tub heaters are made by several different manufacturers. Vulcan electric, Hayward, Therm Products and Balboa (BWG) are some of the more popular electric spa heaters.

For every brand name heater, there are no-name heaters that appear on the market for less.

Heaters should last for many, many years and are most affected by poor water chemistry or high pH readings.

Keeping pH in the ideal range of 7.2-7.6 can greatly decrease the chance of heater failure.

The initial symptoms of a broken spa heater are the inability of the spa to maintain spa temperature or the excessive cycling of the spa as it continuously tries to heat the water to the set temperature.

Titanium vs. incoloy heaters are considered more robust than their predecessors, but even if the heater coil, element and tube are made of the best materials, poor water quality is the number one reason why these components can fail. Incoloy heaters are just fine for the purpose of heating spa water.

See some of the sample heater listings below.

 

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