Gas heater or heat pump—what’s actually better for keeping pool water warm?

J

James Carter

Member
I’m thinking of adding something to keep my pool warm during the cooler months, but I keep going back and forth. Gas sounds fast, but maybe pricey over time? Heat pump seems cheaper to run, but I’ve heard it takes forever to heat up. I’m in an area where spring and fall aren’t freezing, but still not warm enough to swim without some help. Has anyone here tried both and figured out what worked better? I’m all ears. nn
 
James Carter said:
I’m thinking of adding something to keep my pool warm during the cooler months, but I keep going back and forth. Gas sounds fast, but maybe pricey over time? Heat pump seems cheaper to run, but I’ve heard it takes forever to heat up. I’m in an area where spring and fall aren’t freezing, but still not warm enough to swim without some help. Has anyone here tried both and figured out what worked better? I’m all ears. nn
Click to expand...
I’ve had both and honestly, it depends on how fast you want the water warm. My gas heater is great for quick weekend warmups but it definitely hits your gas bill. The heat pump I had before was more efficient long-term but slow to heat up, especially if nights were chilly. If you’re using your pool regularly in spring and fall, a heat pump could save you money overall, just be ready for slower heat-up times.
 
I went with a heat pump last year and it’s been solid. Yeah, it doesn’t heat up fast like gas, but once you keep the temp stable, it’s cheaper to maintain. I use a solar cover overnight and it really helps hold the heat. If you only swim occasionally and want fast heat, gas might make sense, but for steady use, the heat pump wins on running costs.
 
Same debate here. I ended up renting a house once with a gas heater and it was awesome for last-minute swims but expensive if you leave it running. I’ve got a heat pump now and while it’s slower, I just leave it running a little longer during cool seasons and it does fine. Like others said, pair it with a solar blanket and it’ll keep the water nice without spiking your energy bill.
 
I treat my pool heater like a personal trainer it’s either a quick, intense workout (gas heater) or a slow, steady routine (heat pump). I’ve realized that for my pool, the heat pump is like that trainer who encourages me to take it slow but stick with it for the long haul. Anyone else feel like their heater has its own workout schedule?
 
My pool heater is like that one friend who always shows up fashionably late takes forever to get warm, but when it does, it's worth the wait. I feel like the pump’s just trying to be chill about the whole thing, while secretly plotting to raise my energy bill. Anyone else feel like their heater has its own unique personality?
 
James, I wrestled with the same decision a couple of years back. What tipped it for me was looking at how I use the pool. If you’re more of a “spur of the moment, let’s swim today” type, gas is the only thing that can bring the water up quickly enough. But if you’re the kind who keeps the pool at a steady temperature all season, a heat pump makes more sense.

One thing I did that made the choice easier was checking my utility rates. Gas is pretty expensive in my area, so even though the heater worked fast, the bills stacked up quickly. The heat pump felt slow at first, but once I paired it with a decent solar cover, it was surprisingly consistent and much cheaper month to month.

I’d say the better option comes down to whether you want “instant” heat or “steady” heat. If you know your swimming pattern, that’ll point you in the right direction.
 
James, I was stuck on the same decision not too long ago. It really depends on how you use the pool. For me, I don’t do a lot of last-minute swims, so waiting on a heat pump wasn’t really a problem. Once it got the water up to where I wanted it, it stayed there without draining my wallet every month.

That said, a buddy of mine has a gas heater and swears by it because he and his family only use the pool on random weekends. He’ll fire it up in the morning, and it’s swim-ready by the afternoon, no problem. The bill stings a bit, but he’s fine with it since it’s for occasional use.

If your spring and fall temps aren’t freezing, a heat pump might be the cheaper long-term option. But if you like spontaneous swims, gas still wins for convenience.
 
For me, it came down to speed versus efficiency. Gas heats almost instantly but costs more to run. Heat pumps are slower but much cheaper long-term and can keep the pool comfortably warm for regular use. If you don’t need instant heat, a heat pump is usually the better investment.
 
I’ve used both at different houses, and honestly, it depends on how patient you are. The gas heater we had before was awesome for spontaneous weekend swims, it’d warm the pool in just a few hours, but the gas bills made me cringe if I used it too often. The heat pump I have now takes its time, but once it’s up to temperature, it’s super steady and barely adds anything noticeable to my power bill.

If your seasons are mild, the heat pump’s probably the smarter choice long-term. Just make sure to cover the pool at night to hold the heat in. I learned that trick after watching mine lose half its warmth overnight!
 
I went through this same back-and-forth last year before finally settling on a heat pump. The gas option was tempting because of how quickly it can warm things up, but after looking at the long-term costs, it just didn’t make sense for how often we swim. With the heat pump, I leave it set around 84°, and it just quietly maintains that temp most of the week without me thinking about it.

If you’re the type to plan pool time ahead, the heat pump’s slower pace isn’t really an issue, just let it run consistently and it keeps things nice. But if you like spontaneous dips or live somewhere that cools off fast in the evenings, gas definitely has the upper hand.

One more tip: whichever route you go, get a decent solar cover. It makes a huge difference in holding heat overnight and saving the heater from doing all the heavy lifting.
 
Hey James, I’ve tried both and what worked best really depends on how you use the pool. Gas heaters are great if you want the water warm quickly for a last-minute swim, they’re fast, but the running costs can get high if you use them regularly. Heat pumps take longer to bring the water up, but once it’s at the right temperature, they maintain it efficiently and the energy bills stay much lower.

If your spring and fall temps aren’t too cold, a heat pump paired with a pool cover overnight makes mornings much more comfortable without spiking costs. Basically, if you plan ahead and like consistent warmth, a heat pump is the better long-term choice. If spontaneity and fast heat are your priorities, gas is the way to go.
 
I’ve gone through the same debate, James. When I first got my pool, I went with gas because I liked the idea of being able to heat it up on short notice, and it definitely delivers on that. But once I started using the pool more regularly, the gas bills added up fast. I switched to a heat pump last year, and while it’s slower to warm up, it’s way more efficient once you keep the water at a steady temp.

If your area doesn’t get too cold, a heat pump’s usually the smarter long-term option. It keeps the pool consistently warm without draining your wallet every month. Just make sure you cover the pool at night, that alone saves a ton of energy and helps the pump maintain the heat instead of constantly trying to catch up.
 
I’ll add one angle I don’t see mentioned much yet: noise and day-to-day feel. I’ve got a heat pump now, and while it’s slower, it’s basically “set it and forget it.” It hums along in the background, and I don’t think about it unless the weather really turns. My old gas unit felt more like an on/off decision every time, great results, but I was always mentally calculating whether the swim was worth the cost.

Something else that surprised me was how much timing matters. With a heat pump, if you start heating a day earlier than you think you need to, it rarely feels slow. People say they’re sluggish, but that’s usually when you’re asking it to do everything at once after the water’s already cold. If you stay a step ahead of the weather, it’s pretty painless.

One small detail that pushed me away from gas was maintenance. The gas heater needed more attention over the years, especially once it got older. The heat pump hasn’t been totally hands-off, but it’s been simpler overall.

For mild spring and fall conditions, I’d lean heat pump unless you truly live for last-minute swims. If you plan even a little bit ahead, the slower option doesn’t really feel slow at all.
 
If I were you in a spring and fall climate that is not freezing but still too cool to swim comfortably, a heat pump usually wins for holding a steady warm temp because it’s meant to run longer and maintain, while a gas heater shines if you only heat occasionally and want fast temperature boosts for a weekend, so it’s less about which is “better” and more about your swim pattern, if you want to swim several times a week and keep 82 to 84 consistently a heat pump typically makes more sense, but if you mainly want quick 5 to 10 degree jumps on demand gas feels way better even if the bills can add up, and the biggest key for either option is reducing nighttime heat loss since that’s where most of the heat disappears.
 
Most of the speed vs efficiency stuff is covered already, so I’ll add one practical thing that surprised me once I actually lived with a heater, how much heat you lose overnight compared to how fast you can add it.

In mild spring and fall weather, the heater choice matters less than whether you’re constantly reheating cold water. I had a gas heater at one place and a heat pump later, and the big difference wasn’t daytime heating, it was what happened after sunset. Without a cover, both systems were basically fighting evaporation all night. The gas heater just let me brute-force it the next day, while the heat pump made me plan ahead.

Another thing people don’t always factor in is water temp stability. Heat pumps really like steady conditions. If your water only drops a couple degrees overnight, they feel perfectly fine and don’t seem slow at all. If you let the pool fall 8–10 degrees between swims, that’s when they feel painfully sluggish. Gas doesn’t care, it’ll just burn its way back up.

For shoulder seasons like you described, I usually frame it like this: if you want the pool warm all week and you swim a few times, heat pump feels better day to day. If you mostly care about weekends or surprise swims after work, gas feels less frustrating even if it costs more. Either way, a cover at night does more for comfort than upgrading heater size. That’s the one lesson I wish I’d learned earlier.
 
You must log in or register to reply here.
Back
Top