Heater differences and hot tub covers

We recently received an excellent comment on our blog post Gas Hot Tub Heaters VS Electric Hot Tub Heaters. Sandra says…

“In Hawaii our propane is $6.00 a gallon while our electricity is .45 cents a kilowatt. Either way you cut it, it is very expensive to run a hot tub but I’m not sure that running the heat for hours every day as opposed to turning on the gas only when you want to heat it up makes much sense. If the tub is used irregularly it makes more sense to use gas; which heats up in 30 minutes as opposed to electric which takes 3 hours to heat up the same amount of water. So what I’m learning is that electric heaters are meant to run for hours a day with the circulating pump and have a cover that keeps in the heat where as the gas heaters are meant to use on demand. So it will depend on the usage as to which one makes more sense. The question now is where to have a hard cover made since we put in electric before realizing all of the above.”

It’s true that a gas heater will heat the water faster than an electric heater, and you’re “spot on” that the faster heat rise is tailor made for a tub that’s used infrequently (e.g., no more often than just on the weekends), but even if you use the tub just a couple times per week, and regardless of the energy source, it will probably cost the same to keep it heated for use at all times as it will to allow it to cool between uses, assuming that it is covered when not in use.

You have to run the pump a certain number of hours per day for proper filtration, again regardless of use, and in most situations a good-sized electric heater will regain the heat lost over the previous day in a small fraction of the time needed for filtration.

We have formulae into which we plugged your energy costs. Those costs are extraordinary – no doubt part of that “paradise tax” we’ve heard you Hawaiians pay – and although electric is generally less expensive than propane in most locales, it’s about double the cost in your case, and that would have been the best reason to install a gas heater versus an electric.

Since you already have an electric heater installed, you can take as a consolation the difference in cost between the two heaters, because the cost of a gas hot tub heater is over twice the cost of an electric hot tub heater. Even though in your case the cost of running a gas heater would have been less than that of an electric heater, if your tub will only be use infrequently, it would have taken that much longer to recover the difference in the costs of the two types of heaters.

Although it doesn’t apply in your case, as a side note to others reading this response, and as noted elsewhere in our blog, a gas heater should never be operated outdoors in freezing weather.

Regardless of how much your tub is used or the type of heat source you’re using, you definitely want to cover your hot tub. A cover definitely does help keep heat in, but it also helps keep dirt and debris out. Even though you’re filtering and running your tub regularly (as you should regardless of use), leaving it uncovered would be an open invitation not only to falling debris (such as leaves), but also to animals, bugs and even possibly other people. A hot tub that is uncovered and unattended could quickly turn into a possible liability.

Of course you can get your hot tub cover from us! We offer a custom cover at the same price you’d pay elsewhere for a mass produced cover, and you should be very careful to steer clear of any covers made in China, as the materials and workmanship are clearly substandard. If you’re going to go through the trouble and cost of getting a new cover, wouldn’t you want it to fit your hot tub exactly and last many years? On http://www.almostheaven.net/aho/covers.htm you can see the options and pricing for our covers. You can give us your hot tub’s exact dimension, and we’ll make you a cover that is exactly the right size and shape.

Hope to hear from you soon!

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2 Responses to “Heater differences and hot tub covers”

  1. Gold Price says:

    Most people who opt for conventional heated systems usually have a definite idea about how they want to (or have to) heat their tub. For those exploring options, we generally suggest gas/propane heat because even our smallest gas heater has a much faster heating rate than our 11 kW electric heater. Fast heating allows you to heat the tub only when you want to use it, or to keep water at an economical “maintenance” temperature and raise it to “tubbing temp” as desired. In contrast, the slow heating rate of electric heater requires you to keep water at or near “tubbing temp” all the time.

  2. admin says:

    Gas heaters, however, are much more expensive to initially purchase than their electric counterparts. We encourage exploring all options, including a careful comparison of heating costs between gas and electric. One thing to consider when selecting a gas heater is that most aren’t rated to be operated in temperatures below 40 degrees Fahrenheit. Doing so will cause premature failure of the heater, and result in having to buy a costly replacement.

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