A Little Bit About Your Spa Heater


One could argue that the hot tub heater is the most important part of your spa. No one wants to sit in halting cold water unless it is 100 degrees outside and I’m sure that is not what you intended to do with your spa when you purchased it. Also if your heater is not functioning properly it can leave you with a frozen expensive mess in cold winter months. We are going to take your by the basics of troubleshooting, spa heater parts, and tips to extend the life of your heater.

Section 1- Trouble Shooting

Now let’s first cover the basics, if you go to get in to your hot tub and what you expected to be a warm relaxing oasis happens to be more like an ice skating rink, there are a few things to check first:

Is there electricity flowing to your hot tub? Check your control panel and make sure the spa is on. Check the GFCI (a breaker built into a strength outlet or housed in a separate box), your high limit, and your home circuit breaker or fuse box. If your GFCI is tripped, it could average that your heater component is to blame. If your hi-limit is tripped it could average that you are not getting water flow and it is time to check on your pump. If nothing is tripped and your nevertheless have no strength we would recommend that you at this point call a spa service technician or an electrician.

Now that the basics are covered and it is determined that you are getting electricity to the tub there are a few other things you can look for. If you are getting strength, the next thing is to see if the spa itself is working. Check your control panel for shared error readings like FLO or OH. A FLO error reading method there is a problem with your water flow. An OH is an over-heated reading. If your water is over-heating chances are you could have a problem with your thermostat or high-limit switch. If you have a water flow problem, you need to take a look at your pump. If you are not getting these errors and you have water flowing and your heat light is on, it is time to check your heater.

After finding your hot tub’s heater assembly(usually a metal tube with a heating component and other electrical elements inside) check for rust and corrosion, if you find these present it is probably time to replace your complete heater assembly.

If the heater housing assembly appears to be in working order and free of rust and corrosion, you can try replacing the heater component. We recommend doing this only if you are very handy as it can be slightly difficult and dangerous, if you need help please contact a specialized spa technician.

Section 2- Heater Parts and Stuff

If you are like me (unhandy), when you first open up your spa and take a look inside at all the parts and try to figure out what each one does it can be a little overwhelming. Here we will provide a little glossary when it comes to the parts of your spa heater.

Heater Assembly – Heater assemblies come in various forms depending on the manufacturer of your hot tub, but the most shared is a stainless steel tube that houses the heater component. The housing exchanges heat produced by the component as the water flows by it. Often the assembly will also integrate the high-limit and the thermostat.

Heater component – The heater component is just what is name says, it is the component which produces the heat to warm your water. Heater Elements are similar to a light bulb in that after so much use they can burn out. Heater elements can also be the victim of calcium build up and corrosion if the spas chemicals are not kept in check.

Thermostat – Consists of a rotating control for setting desired temperature level, and a capillary tube with bulb attached for remotely picking up the spa water temperature. The sensor bulb is often housed in a thermowell for protection. For proper operation, the thermostat must be located in the spa plumbing between the suction point and the heater, NEVER after the heater.

High-Limit – Is a safety switch which is usually closed until there is a problem with excessive heat. Once the temperature reaches its certain set point, it latches open, breaking the circuit. This prevents the heater from meltdown if there is an equipment failure. It must be manually reset by pressing its button, after the temperature condition has returned to normal. A tripped high limit causes strength to be cut before the fuse, closest shutting down both your pump and heater.

Pressure Switch – This is a safety device that shuts off strength to the spa heater circuit if the flow of water is interrupted. It remains closed during normal operation but will pop open if the pump fails, preventing the burn up of the heater if water is not flowing.

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