Utah gives you about ten good weeks of swimming weather if you leave your pool alone. Late June through early September, and even then the mornings are cold and the evenings turn on you fast. Everything past that ten-week window comes from heat you pay for.

Which is why “what heater should I get?” is one of the first questions we hear — and why it’s usually the wrong first question. The heater is only half the equation. The other half is how fast your pool gives that heat back to the ground and the air. Two identical pools with identical heaters can have wildly different gas bills depending on what the shell is made of.

So let’s do this properly. First the four heating options and how they actually behave in Utah’s climate. Then the part almost nobody puts on a bid: insulation.

Why Utah Is a Hard Place to Heat a Pool

Three things about the Wasatch Front make pool heating more expensive here than in most of the country:

• Huge daily temperature swings. A 92-degree August afternoon can drop to 58 by 5 a.m. That overnight delta is when your pool sheds most of its heat, and it happens every single night, not just in shoulder season.
• Dry air. Utah’s low humidity accelerates evaporation, and evaporation is the single largest source of heat loss from any pool — commonly cited at 60–70% of total loss. Dry desert air pulls warmth out of the surface faster than humid air does.
• Cold soil. Below about four feet, Utah ground sits in the 50s year-round and drops further through winter. A pool shell in direct contact with that soil is a radiator pointed at the earth.

Keep those three in mind, because they’re what separate a heating setup that works from one that just runs constantly.

Option 1: Natural Gas Heaters

Gas heaters burn fuel to heat water passing through a heat exchanger. They’re the workhorse of the industry and they have one enormous advantage: speed. A properly sized gas heater will raise a pool 20 degrees in a matter of hours, regardless of the outside temperature.

Where gas wins

If you want to swim on demand — a warm Saturday in April, a cool September evening when the family’s in town — gas is the only option that responds fast enough. It also doesn’t care how cold the air is, which matters here. And the equipment cost is the lowest of the true heating options.

Where gas hurts

Operating cost. Gas heaters are rated by efficiency (typically 82–95%), and even a high-efficiency unit is converting expensive fuel into heat that your pool is actively trying to lose. Utah homeowners running a gas heater aggressively through shoulder season regularly see hundreds of dollars a month in additional gas. They also have the shortest service life of the heating options — 8 to 12 years is typical, less if your water chemistry has been neglected.

Best fit: Households that want spontaneous swimming and a spa, and are willing to pay for it. Also the right choice as a backup to a heat pump.

Option 2: Electric Heat Pumps

Heat pumps don’t generate heat — they move it, pulling warmth out of the ambient air and transferring it into the water. Because they’re moving energy rather than creating it, they hit coefficients of performance around 5 or 6, meaning roughly five to six units of heat per unit of electricity. On paper that’s dramatically cheaper to run than gas.

Where heat pumps win

Running cost, by a wide margin, and lifespan — 15 to 20 years is normal. If your goal is holding a comfortable temperature across the full season rather than rapid heat-ups, this is the most economical way to do it.

Where heat pumps struggle in Utah

They need warm air to harvest. Efficiency starts falling off below roughly 55°F ambient and drops sharply from there. In Lehi that means a heat pump is excellent from late May through mid-September and increasingly ineffective in the exact shoulder weeks you were hoping to buy. They’re also slow — measured in days, not hours, for a meaningful temperature change — and they need real clearance for airflow, which affects equipment pad placement.

Best fit: Homeowners who swim regularly through the core season and want the lowest cost per swimmable day. Excellent paired with gas for shoulder-season boosts.

Option 3: Solar Heating

Solar systems circulate pool water through roof-mounted collectors and return it warmed. No fuel, no meaningful operating cost beyond the pump you already run.

Where solar wins

Utah has genuinely excellent solar resource — high elevation, high sun-hour counts, lots of clear days. Once installed, solar heat is effectively free, and a well-sized array can add 8–12 degrees during the core season and extend usable weeks on either end.

Where solar falls short

It needs area — typically collector surface equal to 50–100% of your pool’s surface area — with unobstructed south or southwest exposure. It has no control: cloudy week, no heat. And it produces the least when you most want it, in the cold shoulder months. It’s a supplement, not a system you rely on alone.

Best fit: Homes with the roof space and orientation for it, layered on top of gas or a heat pump to cut runtime.

Option 4: The One That Isn’t a Heater — Structural Insulation

Here’s the shift in thinking that saves Utah homeowners the most money: the cheapest heat is the heat you never lose.

Every conversation above is about adding energy. None of them address the fact that a conventional concrete or gunite shell has essentially no thermal resistance. Concrete conducts heat readily. Poured against 50-degree Utah soil, a gunite shell transfers warmth into the ground continuously, all season, in every direction. Your heater isn’t just warming water — it’s warming your backyard.

This is why we build with the Advantage structural foam system. The shell itself is engineered EPS — expanded polystyrene — which is a structural element and a thermal barrier at the same time. The same material that gives the pool its form is the material that stops heat from leaving it. Nothing gets bolted on; the insulation is the wall.

What that changes in practice

• Your heater runs less. Retained heat means shorter cycles for the same water temperature. Whatever heating method you choose, insulation multiplies its effect.
• Overnight losses shrink. Utah’s brutal day-night swing is where uninsulated pools bleed out. An insulated shell holds temperature through the night, so you’re topping up in the morning instead of starting over.
• The shoulder season gets longer for free. The weeks a heat pump can’t reach and solar can’t supply are exactly the weeks insulation buys back.
• The water feels different. Insulated walls don’t pull warmth out of your skin the way cold concrete does. Homeowners notice this before they notice the bill.

The construction advantages come along with it: the panel system can be built accurately on sloped and tight lots where heavy gunite equipment struggles, build times are shorter, and the finished shell is clad in a marble-look interior finish. On warranty specifically — because it gets misquoted constantly — the pool carries a 2-year warranty, and the waterproofing system is rated for 40+ years. Those are two different numbers and we’d rather you hear them stated plainly.

The Combination We Actually Recommend

For most Utah families, the best-performing setup isn’t a single choice. It’s a stack:

1. An insulated structural foam shell as the foundation — it reduces the load on everything else, permanently, with no operating cost.
2. A high-efficiency heat pump as the primary heat source for the core season, where its running cost is unbeatable.
3. A gas heater sized for the spa and for on-demand shoulder-season heat-ups.
4. An automatic cover — the highest-return accessory in pool ownership, because it attacks evaporation, the largest loss channel of all. Nothing else you buy cuts heating cost this much per dollar spent.
5. Solar if your roof supports it, to offset core-season runtime.

Notice that two of the top four items aren’t heaters at all. That’s the point. Utah’s climate punishes heat loss harder than it rewards heat production, so the money is in the envelope.

Questions Worth Asking Your Builder

• What’s the thermal performance of the shell you’re proposing — and if it’s zero, what’s the plan to offset that?
• What temperature will this system hold in mid-May and mid-September, not just July?
• Is the heater sized for the pool alone, or pool plus spa?
• What’s the projected monthly operating cost at my target temperature, by month?
• Is an automatic cover in this bid, and if not, what does it add?

A builder who can answer those in specifics is thinking about your fifteen-year cost. One who can only quote heater brands is thinking about the install.

Run Your Own Numbers

Heating strategy affects both your build budget and your monthly cost of ownership, so it’s worth scoping early rather than deciding at equipment-selection time. Our pool cost calculator will give you a realistic starting range for a custom insulated pool in Utah, including the equipment decisions above — and it takes about two minutes.

Advantage Custom Pools builds custom pools, spas, retaining walls, and outdoor living spaces throughout Utah from our shop in Lehi. If you want to talk through what it would take to make your pool comfortable in April and October instead of just July, we’re happy to walk you through it honestly, including where insulation does and doesn’t move the needle for your specific lot.