# Thread: Hours to heat spa

1. ## Hours to heat spa

So I finally had my gas line hooked up on December 31....however it takes about 4 hours, sometimes 5 hours, to bring my water up to 100 degrees. I am very frustrated. Is this normal?

Usually starting from 40 degree water.

2. ## Re: Hours to heat spa

Mine takes less than 20 minutes to go from 50 to 104. I also have the largest gas heater for residential use.

3. ## Re: Hours to heat spa

You have something going on. Either the heater is too small, the spa is huge, or you're also heating the pool. Make sure the spa is isolated completely from the pool when running the heater. There should be no spillover.

When I heat the spa, I move the valves around and draw the water in the spa down a few inches to allow for the displacement when we get in. There's nop point heating it to just let it overflow into the pool. I also don't run the booster or the air jets, and I stick the cap from a can of spray paint over the air intake pipe, because cold air being injected defeats the whole purpose.

You can crunch some numbers. A gallon of water is about 8 pounds. One BTU raises one pound of water one degree Fahrenheit. Calculate how many pounds of water and how many degrees change and look at the BTU rating of your heater. That will tell you how long it should take to heat it in a perfect world. If it takes more than twice that, something is wrong. You lose some heat to the outside air and warming the concrete walls.

4. ## Re: Hours to heat spa

I have switched all the valves, and I am never heating the pool or having a spillover when the spa is running. I think something is wrong too, since most people say it takes them around 20 minutes. No, we wait 4 to 5 long hours...my pool builder says all is fine.

Yesterday my spa was on for 6 hours...I think my gas bill is going to be awful.

I do have a large spa, and the BTU is only 199.

5. ## Re: Hours to heat spa

"Large spa" is very general. Do you know gallon wise?

6. ## Re: Hours to heat spa

From my calculations, it is about 9300 gallons.

7. ## Re: Hours to heat spa

Originally Posted by Hemess
From my calculations, it is about 9300 gallons.
That's a pool, not a spa!!

8. ## Re: Hours to heat spa

Originally Posted by Richard320
Originally Posted by Hemess
From my calculations, it is about 9300 gallons.
That's a pool, not a spa!!

Lol...I am recalculating.

9. ## Re: Hours to heat spa

Lol yeah that's a huge spa!

10. ## Re: Hours to heat spa

Ok...maybe it is around 400 gallons. Looks like with my BTUs (199) it should heat 30 degrees in between 43 and 30 minutes. It has taken 4 hours to go from 49 degrees to 90...still not at 100 degrees.

11. ## Re: Hours to heat spa

Originally Posted by Hemess
Ok...maybe it is around 400 gallons. Looks like with my BTUs (199) it should heat 30 degrees in between 43 and 30 minutes. It has taken 4 hours to go from 49 degrees to 90...still not at 100 degrees.
Yeah, that's about what I calculate, too. Something isn't right.

12. ## Re: Hours to heat spa

Silly question ... Is suction coming from the spa and not the pool?

How far is the heater from the spa? Previous house would take a while to heat the spa in the winter, but the equipment pad was a good distance from the pool ... Lots of heat loss in the underground pipe.

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13. ## Re: Hours to heat spa

Originally Posted by jblizzle
Silly question ... Is suction coming from the spa and not the pool?

Posted from my Droid with Tapatalk ... sorry if my response is short
The 2 valves are like this:
1. Drain closed on pool, open on spa.
2. Returns closed on pool, open on spa

I am so frustrated, and I know my gas bill will be outrageous...I have run the spa 12 hours this weekend to use it for 3 hours. Cry

14. ## Re: Hours to heat spa

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15. ## Re: Hours to heat spa

Originally Posted by jblizzle

Posted from my Droid with Tapatalk ... sorry if my response is short
50 feet from spa and equipment, they are on the same side of the house.

16. ## Re: Hours to heat spa

That actually sounds like a fairly long plumbing run, but I am not sure how much it would affect the heat rate. You are certainly losing a lot of heat to the surrounding ground ... I have read of some people actually putting insulation around their pipes before filling with dirt.

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17. ## Re: Hours to heat spa

My heater is on the opposite side of the house and its still only around 20 min even in the winter. My pool is 42,000 gallons and the heater will do it 1* per hour. I think you have something wrong. On a bright note last year I would hear the spa up 5 nights a week and heated the pool 3 times in one month and my bill was only \$150. And when I would hear the pool it would run 30 or so hours.

18. ## Re: Hours to heat spa

So....talked to pool builder today. He tried to blow me off and blame it on weather and surface area, but I stuck with it. He investigated and called the heater manufacturer. Looks like it has to do with my gas installation and he is going to talk to installer. Hopefully it can get solved. He informed me it was about 800 gallons....I didn't tell him I had said 9300 and 400 gallons. Lol. Progress.

There are more problems with the spa related to valves...but I will spare you the details as it happens after we are done using the spa.

19. ## Re: Hours to heat spa

Update: my gas line was replaced today with a larger, 1 inch pipe rather than the 3/4 inch pipe that was originally installed. I was excited to come home and heat the spa and see how much faster it heated up....however, it appears that someone (pool builder or plumber) left my gas on all day. Nice.

Still worried about my gas bill. Yikes.

20. ## Re: Hours to heat spa

So the gas was on but no flame?

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