If you’re here reading this, chances are you either own a 5-person outdoor spa (or are in the market for one) and you’ve noticed those utility bills creep up faster than a toddler chasing a ice cream truck. Let me tell you something— as a supplier who’s sold over 1,200 of these 5-person units in the last 7 years, I get it. A lot of customers come to me thinking “outdoor spa = high energy costs” but that’s not a rule—it’s a habit. Over the years, I’ve worked with hundreds of existing owners to tweak their setups, and I’ve built every new unit with efficiency baked in from day one. Today, I’m pulling back the curtain on the science-backed tweaks that actually cut energy use for 5-person outdoor spas, no fluff, no half-baked hacks—just what works. 5 Person Outdoor Spa
First, let’s ground this in why 5-person spas have unique energy needs. Unlike smaller 2-person models that might sit unused for weeks, most 5-person spas (our most popular size) are for families, small groups of friends, or even Airbnb hosts looking to offer a premium amenity. That means they’re often used 2-5 times a week, held at a standard 102-104°F, and have to heat a larger water volume—roughly 300-350 gallons, vs 150-200 gallons for a 2-person model. That larger load is where inefficiency hides, and where efficiency gains deliver way more noticeable savings.
Let’s start with the biggest energy drain most owners miss: the spa cover. I can’t tell you how many times I’ve arrived at a customer’s house, bent down to check their cover, and found gaps along the edge from a broken latch, waterlogged foam, or just a cover that’s too small for their specific 5-person spa. The cover’s job is simple: it traps heat by preventing conductive and radiant heat loss. Every 1 inch gap along the edge can increase heat loss by up to 25%—that’s not a guess, that’s data from the Spa and Pool Industry Association (SPIA), the group that sets testing standards for all spa equipment. I’ve seen customers spend $80 a month extra on electricity because their cover was held together with duct tape. So what fixes this? First, if your cover is more than 5 years old, replace it. The foam core in cheap covers breaks down, and the vinyl outer layer gets brittle, letting moisture seep in. Our company uses 2-inch thick closed-cell foam for all 5-person spa covers, which is 3x more resistant to water absorption than standard foam. Second, make sure your cover is the exact size for your spa. A lot of off-brand covers are made to fit “generic 5-person” spas, but ours (and most reputable brands) have custom dimensions for the exact footprints (ours are 7ft x 7ft, for reference) so the cover fits tight. Finally, use the cover lifter! How many people yank their cover off, set it on the deck, and leave it for 2 hours while they run inside? Every minute the cover is off, your spa loses heat fast. A lifter keeps the cover off the ground, prevents sun damage to the vinyl, and makes it way easier to get it back on when you’re done—so you’re way more likely to use it consistently.
Next up: temperature set points. I know, I know—104°F is the “standard” for spa use, but here’s a fact: for every 1°F you lower your set temperature, you cut energy use by 3-5%. That’s not a random number. Heat transfer physics tell us that the rate at which a hot object loses heat to the surrounding air depends on the temperature difference between the two. So if your spa is at 104°F on a 50°F day, that’s a 54°F difference, which means constant heating. But if you lower it to 100°F, that’s a 50°F difference—less strain on the heater, less electricity. Now, I’m not saying you need to sit in a cold spa! For most 5-person spa owners, we recommend adjusting the temperature when you’re not using it. If you have a family, lower it to 98°F during the day when no one’s home, and bump it up to 102°F 1-2 hours before you want to use it. For Airbnb hosts, this is a game-changer—they often leave their spas at 104°F 24/7, but switching to a set-it-and-adjust-it schedule cuts their monthly bill by $40-$60. Another pro tip: use a timer or smart spa controller if you have one. Our 5-person units come with a basic digital controller, and we recommend upgrading to a smart model (add-on for $120) that syncs with your phone so you can adjust the temp from anywhere. Last winter, a regular customer of mine who owns a cabin with our 5-person spa went from $112 a month to $48 a month after setting a timer to lower the temp at night.
Then there’s the pump—another huge energy drain. Most standard 5-person spas come with a single-speed pump that runs at full power 100% of the time, which is super inefficient. Here’s the thing: jets only need full power for 10-15 minutes when you’re actually using the spa. The rest of the time, the pump just needs to circulate the water to keep it clean and prevent bacteria growth. That’s why variable-speed pumps (VSPs) are such a big upgrade. For our 5-person spas, we switched from single-speed to a 2-speed pump a few years ago, and the energy use dropped by 40% on average. The science here is simple: a single-speed pump uses a fixed amount of electricity regardless of load, while a VSP uses much less power when running at low speed for circulation. For example, running a 2-speed pump on low uses 1/5th the electricity of running it on high. If you have an older 5-person spa with a single-speed pump, replacing it with a 2-speed or variable-speed pump is one of the best investments you can make. We offer a pump upgrade for our 5-person models, and I always tell customers it pays for itself in 18-24 months in energy savings. Also, don’t run the pump longer than you need it to—keep it on 2-4 hours a day, split into two cycles (morning and evening) instead of 8 hours straight. Over-circulating is just wasting power.
Water chemistry and filter maintenance—this is the part most people overlook, but it’s a hidden energy drain. If your spa water is dirty or unbalanced, the pump has to work harder to circulate it, and the heater has to work harder to keep the water at temperature because the water’s conductivity is off (wait, no—actually, it’s about flow resistance. Dirty filters restrict water flow, so the pump uses more energy to push water through, and a buildup of minerals on the heater element reduces its efficiency). Let’s break it down: first, check your filter every 2 weeks. For a 5-person spa, you need to clean the filter with a filter cleaner (not just a hose spray—low pressure water doesn’t get the gunk out) every 2 weeks, and replace it every 12-18 months. A clogged filter can increase pump energy use by up to 30%. I see this all the time—customers wait 6 weeks to clean their filter, and their electric bill spikes, and they think it’s the spa itself, not the dirty filter. Second, balance your water chemistry. The pH should be between 7.2 and 7.8, and the total alkalinity between 80 and 120 ppm. When water is unbalanced, it causes scale buildup on the heater element, which acts like an insulator. If your heater element has a thick layer of scale, it can take 2x as long to heat the water, which means using twice as much electricity. Our team does a free water balance check for all our 5-person spa customers, and we send monthly reminders about filter cleaning because this simple step is responsible for saving about 15% of energy use for most owners.
Location, location, location—where you put your 5-person outdoor spa makes a massive difference. I know, if you have a small deck, you might not have options, but if you can place it strategically, it cuts energy use a lot. The biggest enemy is wind. Wind increases heat loss from the spa by carrying away warm air that rises from the water. A study by the American Council for an Energy-Efficient Economy (ACEEE) found that wind speeds over 5 mph can increase spa energy use by 20-30%. So if you can, place your spa in a spot that’s protected from prevailing winds—like next to a fence, a house, or a large shrub. Avoid placing it in an open area that gets constant wind, like a corner of a deck exposed to the lake or a open yard. Second, sunlight: if you live in a sunny area, placing your spa where it gets direct sunlight for 2-3 hours a day can preheat the water, reducing how much the heater has to run. Even in winter, sunlight adds a few degrees of natural heat, which cuts energy use. One customer of mine in Arizona had their 5-person spa placed under an oak tree that blocked sunlight, and after moving it to a sunnier spot, their energy use dropped by $35 a month. If you can’t move it, a simple solar cover (which we include on all our new 5-person spas, by the way) adds an extra layer of heat retention from the sun.
Heater type matters too. When we design our 5-person outdoor spas, we use high-efficiency natural gas or propane heaters (depending on the model) instead of electric resistance heaters, because gas heaters are 2-3x more efficient for spas that are used regularly. Wait, I know some people worry about the cost of gas, but when you compare the energy output, it’s cheaper in the long run for frequent use. If you have an older 5-person spa with an electric resistance heater, upgrading to a gas heater is a big energy saver—though we always tell customers to check their utility rates first, because if electricity is super cheap in their area, an electric heat pump might be better. Heat pump heaters are another great option—they pull heat from the air instead of generating it, so they use 70-80% less electricity than standard electric heaters. We offer a heat pump upgrade for our 5-person spas, and it’s especially popular with customers in mild climates (50-80°F year-round). The only caveat for heat pumps is that they’re less efficient in very cold weather (below 40°F), so they work best if you lower the temperature when you’re not using them anyway, which aligns with the tip I mentioned earlier.
One last thing: regular maintenance checks. I know it’s easy to forget about your spa until something breaks, but a quick check every month can catch small issues that turn into big energy drains. For example, a loose union on the pump or heater can let air in, which reduces flow and makes the pump work harder. A damaged gasket on the spa door can let heat escape. We offer an annual maintenance service for all our 5-person spa owners, and for $99 a year, we check all the components, clean the filters, test the heater efficiency, and adjust the cover to make sure it’s sealing tight. Most customers who use this service say it saves them at least that much every month on their energy bill, not to mention preventing costly repairs down the line.
Now, I want to be clear: none of these hacks are one-size-fits-all. A 5-person spa for a family that uses it every night will have different needs than one for an Airbnb that’s only used on weekends. The key is to pick a few of these tweaks that fit your usage, not all of them. For example, if you’re an Airbnb host, the timer and temperature schedule are non-negotiable. If you’re a family who uses it every night, upgrading to a variable-speed pump is worth the investment.
At the end of the day, improving your 5-person outdoor spa’s energy efficiency isn’t just about saving money—it’s about being more responsible with energy, and getting to enjoy your spa without the guilt of a sky-high bill. I’ve been in this business long enough to know that when customers have a spa that’s efficient, they use it more, not less. That’s the goal, right? A spa should be a source of relaxation, not a source of stress about utility costs.
If you’re looking for a new 5-person outdoor spa, or you currently own one and want to talk through specific tweaks for your setup, my team and I are here to help. We work with customers across the country, offering personalized consultations, pump and cover upgrades, and annual maintenance services tailored to your usage and location. There’s no one-size-fits-all solution, but we’ll help you find what works for you.
6 Person Outdoor Spa References
Spa and Pool Industry Association. (2022). Energy Efficiency Standards for Residential Spas.
American Council for an Energy-Efficient Economy. (2021). Outdoor Spa Energy Loss and Mitigation Strategies.
U.S. Department of Energy. (2020). Guide to Efficient Residential Hot Tubs and Spas.
SpaRelax Co., Ltd.
SpaRelax Co., Ltd. is one of the best China 5 person outdoor spa manufacturers and suppliers, and as a professional company, we have productive factory, which is able to produce cheap 5 person outdoor spa with reliable quality. Welcome to wholesale products from us.
Address: Daluxia, Liucun Group，Liucun Village, Longhua Town, Boluo District, Huizhou City, Guangdong,China
E-mail: sales03@spasrelax.com
WebSite: https://www.sparelaxhottub.com/
