Indoor gunite hot tub….keep & renovate?

Chedwards

New member
Mar 8, 2025
3
Tri-Cities, WA
Hello all! First time poster, long time lurker. Appreciate all of you, as reading through TFP and this forum has really helped me get my feet under me as a first time Pool owner this past year.

We are currently getting out Pool replastered and tiled.

But, we’ve been dragging our feet on one decision. This Hot Tub. We bought this house a year ago, and when we did, this whole hot tub was covered with a wood framed platform and carpeted over. The story I heard is the previous home owners didn’t use it, and so they just had it sit dry and covered for a decade.

From what I can tell, this hot tub and whole area used to be outdoor on the deck like the pool. But at some point the old homeowner decided to enclose a portion of the deck, and with it, the gunite hot tub. So now it is somewhat indoors, in the enclosed deck.

We like the idea of having a hot tub in here. Dreaming of soaking in it and watching the snow fall outside in the winter months!

It is plumbed to the same equipment room as the pool. The company that is renovating our pool is going to pressure test the lines to make sure it is still good. In the equipment room, it has two pumps (one labeled “spa jets” & other “spa filter”) and a heater, and a sand filter. It appears to be plumbed and operated completely separately from the pool. All of this equipment seems pretty historic, so my assumption is, we’ll have to replace all of it too if we do renovate it.

We have been debating whether we replaster this and get new equipment. Or we just fill it in and put a normal/basic hot tub on top. Although, our contractor warned that’s not as simple as you might think. That there’s permitting we have to do to fill in the hot tub and electrical would have to be run here.

Assuming the lines pressure test okay, what would you do? And pros and cons you guys can think of? Also, if we do decide to keep it as a gunite hot tub, any suggestions as far as renovation and equipment? Any feedback is appreciated!

Thank you!!
 

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Welcome to TFP.

Do you close the pool during the winter?

My guess is that the prior owner learned that running the hot tub in the winter is difficult because the equipment freezes. Corrosive condensation is a problem with gas heaters running in cold temperatures.


If you want to sit in the hot tub and watch the snow fall, replace the spa with a standalone hot tub built to run 12 months out of the year.

Did the gunite hot tub share equipment with the pool or have its own set of equipment?
 
Hello all! First time poster, long time lurker. Appreciate all of you, as reading through TFP and this forum has really helped me get my feet under me as a first time Pool owner this past year.

We are currently getting out Pool replastered and tiled.

But, we’ve been dragging our feet on one decision. This Hot Tub. We bought this house a year ago, and when we did, this whole hot tub was covered with a wood framed platform and carpeted over. The story I heard is the previous home owners didn’t use it, and so they just had it sit dry and covered for a decade.

From what I can tell, this hot tub and whole area used to be outdoor on the deck like the pool. But at some point the old homeowner decided to enclose a portion of the deck, and with it, the gunite hot tub. So now it is somewhat indoors, in the enclosed deck.

We like the idea of having a hot tub in here. Dreaming of soaking in it and watching the snow fall outside in the winter months!

It is plumbed to the same equipment room as the pool. The company that is renovating our pool is going to pressure test the lines to make sure it is still good. In the equipment room, it has two pumps (one labeled “spa jets” & other “spa filter”) and a heater, and a sand filter. It appears to be plumbed and operated completely separately from the pool. All of this equipment seems pretty historic, so my assumption is, we’ll have to replace all of it too if we do renovate it.

We have been debating whether we replaster this and get new equipment. Or we just fill it in and put a normal/basic hot tub on top. Although, our contractor warned that’s not as simple as you might think. That there’s permitting we have to do to fill in the hot tub and electrical would have to be run here.

Assuming the lines pressure test okay, what would you do? And pros and cons you guys can think of? Also, if we do decide to keep it as a gunite hot tub, any suggestions as far as renovation and equipment? Any feedback is appreciated!

Thank you!!

Any reason you can't just have a service company come check things over, fill it up and see if it runs/operates? Looks like an electric heater in the equipment picture, is that correct?
 
Welcome to TFP.

Do you close the pool during the winter?

My guess is that the prior owner learned that running the hot tub in the winter is difficult because the equipment freezes. Corrosive condensation is a problem with gas heaters running in cold temperatures.


If you want to sit in the hot tub and watch the snow fall, replace the spa with a standalone hot tub built to run 12 months out of the year.

Did the gunite hot tub share equipment with the pool or have its own set of equipment?
Thanks ajw! We are in Eastern Washington State, and the winters get below freezing, so we do shut down the pool for the winter. Pool season is approximately May - September here.

The existing heater was an electric one. That’s a good note on corrosive condensation though, because we had considered replacing with gas. But I suppose if we keep this hot tub, we’d need to stay electric.

I’m kind of leaning towards filling it in and replacing with a standalone hot tub. Seems like less hassle than needing to go to the equipment room and deal with stuff there. The argument for keeping it I’ve heard is that, “it’s a permanent structure that you’re investing in, versus a standalone hot tub that is not”. My only problem with that is, they’re not exactly permanent….as replastering is needed every decade or two.

Ultimately, I’m waiting on a quote from the contractor on a replaster and new heater/pump/filter for the hot tub, and will wait until then to decide. But like you suggested, I’m leaning towards a standalone. I need to do some searching on how to go about filling it in. Hoping I can do that one myself rather than paying someone too. If anyone has suggestions there I’d appreciate it!

The equipment and plumbing for the hot tub was completely separate from the pool.

That’s another debate I’m having. I want to eventually update filter and pump for the pool too, and add a heater. If I kept the existing hot tub, I suppose I could plumb them together to share equipment. But that would add complexity to my system, and I think I’m going to need separate heating systems for them. I’m assuming a heat pump would be best for the pool, but we need an electric for the hot tub to run in the winter.

Argh, I don’t know! So many choices. But I think I do like the simplicity of just filling in the hot tub and putting a standalone one there. And then the equipment room is just for the pool!

Thanks for taking the time for the suggestions and response!!
 
Any reason you can't just have a service company come check things over, fill it up and see if it runs/operates? Looks like an electric heater in the equipment picture, is that correct?
So, since this post, I did exactly that! Well, they couldn’t get the heater or pumps to turn on. Not sure if what the problem is there, but they look rusted and trouble enough that I’m imagining I’ll just want to replace.

And they did pressure test the lines to the hot tub. Everything held pressure except for the “jets” return line….and it sounds like that is to-be-expected, because jets return lines typically have a venture aerator to pull in air a make bubbles. That’s what they tell me at least? Funny thing is, we can’t seem to find where that is.

So, I think we’re thinking the next step is to just fill it with water and see if it holds water or leaks.

That is, if I decide to keep going down this route, and don’t decide to just fill it in and be done with it.