A Timer, a Cover and Foam...
Hot Tubs Have Energy Saving Options


Hot tub with hard cover
Your hot tub is not unlike your home's water heater: a large vessel of water that you keep hot for the times you'd like to use it. Unlike your water heater, however, you don't use the hot tub as much as you use domestic hot water, so you may not need to heat it 24 hours per day.

Timers to the Rescue
If you're like many hot tub owners, you really only use the tub (at most) once or twice a day, and generally at pretty routine hours: often in the morning and then again after dinner or just before

Hot tub timer
bedtime. Whatever your usage patterns, you probably have a pretty good idea of the typical hours you use your tub. That's when you want the tub at a desired temperature. One way to reduce hot tub operating costs is to only heat it during the periods when you'll actually be using it. Setting the heater timer to come on and heat the tub 15-20 minutes before you'll actually be using it, and turning the heaters off after you're finished will ensure your lowest operating costs. If you find that the tub isn't up to the desired temperature when you get in, adjust the timers to come on a little earlier.

Some electric utilities offer “off-peak” rates times of day when the cost of electricity is lower. If your utility offers this rate, you may want to consider operating the tub heater during those times. Your monthly hot tub operating costs are determined by how often and for how long the heater has to run to maintain the desired temperature. There are several factors that affect this: the location of the tub, age and insulation level of the tub and the kind of fuel used to heat the tub.

If your hot tub is located inside the house, or in an enclosed area outside, the tub will lose less heat to the environment, and therefore cost less to heat. If it's outside, poorly insulated, or not well shielded from the wind, it may cost considerably more to heat.

Today's modern hot tubs are better insulated than their predecessors. Depending on the age of the hot tub, the insulation can range from a thin layer of foam under the tub shell, all the way up to a fully-foamed cabinet. A fully-insulated tub will maintain its temperature longer, with less supplemental heat required to maintain the desired temperature.


Hot tub blanket
Water Logged
The condition of the hot tub's insulated cover will also have an impact on the cost of operation. If the insulated cover is more than five years old, you may want to think about replacing it. Over time, the foam insulation in the cover absorbs water. That's why the cover gets heavier as it ages. Once the cover becomes water logged, it loses a lot of insulation value and doesn't work as well to stop heat loss. Replacing the cover with a new dry cover will lower your monthly operating costs.

If your tub is located outside, and in a particularly windy spot, consider adding a wind/privacy screen. Not only will the screen reduce the heat loss from the tub caused by exposure to the wind, but it may also increase your comfort while getting into and out of the tub.

More information on reducing energy use in hot tubs, Hot Tub and Pool Conservation Tips, is available from the Washington State University Extension Energy Program.
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