Notes

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My wife and I plan to get a pool soon, but sometimes it’s a bit chilly for a dip in the pool. So I’ve wondered can you use a hot tub heater for a pool? A hot tub heater can heat 500 gallons of water between 3°-6° degrees per hour and has 4-5 kilowatts of power. Pool heaters are roughly 4 times as powerful, meaning a hot tub heater would take significantly longer to heat a pool. It also puts significant wear & tear on the hot tub heater. But it IS possible. But there’s more to know about the crucial differences between pool and hot tub heaters, how long a hot tub heater might take to heat a pool and how many gallons a minute a heater can handle. So let’s check best heat pumps 2019 out! How does a hot tub heater work? Let’s start by examining how a hot tub heater works. Unlike the hot water heater in your house, a hot tub heater is more like the tankless hot water heaters that have become popular over the past decade.

Since they don’t have a holding tank, they simply heat on demand. The pump pulls the water through the heater tube, warming it as it passes. Then, between the insulation on the outside of your hot tub shell and the lid you keep closed on your hot tub when not in use, the heat loss is (hopefully minimal). The actual heater in your hot tub is fairly small. Not counting the box it comes in which often houses all the electrical connections for your entire system, the heater is only a couple of inches in diameter and maybe a foot long. While there’s a lot of brands of hot tub heaters, and a number of options for each brand, the average hot tub heater is probably between 4-5 kilowatts of power. They also are typically well under $500 for the complete control pack which includes the heater as well as the electrical system for all the hot tub components.

A pool heater, by comparison, typically runs a minimum of about $1,000, and often well into the thousands. But to be fair, the pool heaters typically also contain the pump which in hot tub equipment is sold separately. Unfortunately, for direct comparison’s sake, most pool heaters show BTUs, not kilowatts. But doing a little conversion, I’d say the average pool heater is probably between 15-20 kilowatts. So pool heaters are roughly 4 times as powerful. Soon little hot tub heater.. How many gallons per minute can a hot tub heater heat? The average hot tub holds somewhere between 300-600 gallons of water depending on how many people it’s designed to hold. As I mentioned above, there are many sizes and types of hot tub heaters. So combined with the various sizes of hot tubs, and of course, a wide variety of weather, it’s hard to say 1 number that fits every situation. That being said, heat pump installation costs will go up between 3 and 6 degrees each hour.

The other variable is whether you leave your heater on continuously or have it cycle on and off. So to get to 100°, it would take about 6 hours. That amounts to about 1.38 gallons a minute being heater by the average hot tub heater. But again, there are a lot of variables, so just use that as a guide. How many gallons are in an average pool? There are even more variations in swimming pools than there are hot tubs! So for our purposes here, I’m going to give an example of an average in-ground pool as well as an average above-ground pool. The nice thing about above ground pools is they are a uniform height (usually 48″ or 52″), so it’s easier to gauge how much water is in one. In-ground pools, by comparison, often grade from shallow to deep. For an average above-ground pool, we’ll go with a 48″ high and 24′ round pool.


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