What an attached spa actually adds
Have you ever stared out at your backyard in late October and wished you could still use the water? A pool definitely has a limited season here in Utah. A dedicated spa changes all of that.
With a heavy-duty thermal cover, you can easily stop up to 70% of overnight heat loss in our dry climate.
As custom pool builders in Utah, we treat a shared-wall spa as a foundational piece of your yard’s architecture. It gets poured at the exact same time as your main pool shell, so all the hidden mechanics have to be mapped out early. Trenching separate jet plumbing and sizing a dedicated gas heater must happen before a single piece of deck goes down.
Our team always recommends finalizing these mechanical choices first to avoid paying twice for the same trench. From there, you get to choose between a flush design, a raised wall, or a shared wall with a cascading sheer descent. So grab a warm drink, and we will show you exactly how the best Pool & Spa Combinations are built for year-round use.
Heating is the decision people underestimate
Most backyard disappointment traces right back to slow heating times. If your spa shares the main circulation loop, warming it up means trying to heat thousands of gallons of cold pool water first. That leads to freezing evenings waiting around for a soak that never happens.
Our solution is to completely separate the circulation loop using automated manifold valves. This isolates the spa water so the heater can focus purely on that smaller volume. We typically recommend a dedicated 400,000 BTU gas heater for this exact job.
Electric heat pumps are popular, but they simply do not produce enough BTUs quickly enough for a standalone spa. A properly sized gas heater can raise an average spa’s temperature from a chilly 80 degrees to a perfect 104 degrees in about 30 to 45 minutes.
Here are the critical heating components you need to plan for early:
- A dedicated gas line: A high-output heater requires significant gas pressure, so check your meter capacity before installation.
- Automated actuators: These mechanical valves switch the water flow from the pool to the spa instantly.
- Physical windbreaks: Planting a hedge or installing a fence blocks prevailing winds and dramatically speeds up heating times.
Common problems we solve with Pool & Spa Combinations
“Our spa takes forever to heat”
This is almost always an issue with shared plumbing loops and an undersized heater. We design the spa circulation as its own isolated loop right from the start.
That way, a cold body of water becomes perfectly steamy in the time it takes you to eat dinner. A 400,000 BTU natural gas heater is the industry standard for fast heating, vastly outperforming propane or electric options when you are in a rush.
“The spa looks bolted on”
A fiberglass drop-in unit sitting next to a pool rarely feels like a cohesive part of your yard. Our designers prefer to create a shared-wall spa that is poured at the exact same time as the main shell.
This monolithic gunite construction means the finish, the coping, and the tile all match perfectly. It looks like it was always meant to be there because structurally, it is a single unit.
| Feature | Drop-In Acrylic Spa | Shared-Wall Gunite Spa |
|---|---|---|
| Aesthetic | Looks like a separate appliance | Blends perfectly with pool tile |
| Installation | Placed after decking is finished | Poured concurrently with the pool |
| Durability | Vulnerable to UV fading over time | Lasts as long as the pool itself |
“We never actually use it”
This complaint usually boils down to a frustrating control system. If turning on the jets requires walking out to a dark equipment pad to manually turn valves, you simply will not do it on a freezing Tuesday night. Modern smartphone controllers change how you use your yard entirely.
Using highly rated 2026 apps like Jandy iAquaLink or the Pentair Pool app, you gain complete remote access. You can easily control:
- Water temperature and custom heating schedules.
- LED lighting colors and brightness.
- Jet speed and pump operations.
By the time you pull into the driveway, the water is already bubbling at 104 degrees.
“The spillway keeps the water cold”
Running a spillway edge or a sheer descent waterfall while you soak actively pushes all your heated water straight into the main pool. That heat loss is completely normal and expected.
The fix is just operational, so you only need to run the water feature when you want the visual aesthetic. When it is time to soak, your automation system will shut off the spillway and isolate the hot water right where you need it.
Cost guide: what drives spa pricing
Understanding your budget requires looking at both the upfront construction and the long-term utility bills. Most owners spend between $30 and $60 per month in electricity and gas to keep their spa warm during the colder winter months.
Here are the main variables that will drive your initial construction pricing:
- Spa size and elevation. A raised spa requires significantly more steel structure and concrete shell work than a standard flush design.
- Jet count and pump sizing. Installing more jets means running more PVC plumbing and upgrading to a higher horsepower circulation pump.
- Heater capacity and gas supply. Sizing a 400,000 BTU unit for fast heat-up times often means paying the utility company to upgrade your home’s main gas line capacity.
- Automation package. Modern systems require mechanical actuators, digital controllers, and Wi-Fi antennas for smartphone app integration.
- Water feature type. A custom formed sheer descent waterfall costs more in labor and materials than a simple cut-out spillway edge.
- Spa cover. This is absolutely worth budgeting for right away. A high-quality thermal cover protects your heat and cuts water evaporation drastically in the dry Utah air.
We know the spa sits inside a much larger overall project budget. To get the full picture, please read the Utah pool cost guide for accurate regional pricing.
You should also pair that information with our gunite and shotcrete pool construction page to fully understand exactly how these durable shells are built from the ground up. Reach out to our team today to schedule a site visit and start planning your perfect Pool & Spa Combinations.
