Hot Tub Buying Guide: Inflatable, Frame, Built-In & Wood-Fired

A hot tub turns your backyard into a year-round retreat — but the category runs from a $549 inflatable you set up in an afternoon to an $11,000 built-in acrylic spa, and they install, cost, and last very differently. Buying the right one comes down to four decisions: type, size, how it's powered and installed, and the features that actually matter. This guide walks through all four.

At Urban Supply, we carry hot tubs and spas from MSpa, Empava, and SaunaLife — inflatable, frame, built-in acrylic, and wood-fired models seating two to seven people, roughly $549 to $11,870. Start with the type.

Inflatable vs Frame vs Built-In: The First Decision

Inflatable hot tubs are the easiest entry point: they inflate in minutes, need only a power outlet, and can be deflated and stored. They're the most affordable way into hot-tub ownership and ideal for renters, small patios, or trying the lifestyle before committing (MSpa's Comfort, Urban, and Premium inflatables). The trade-off is a shorter lifespan and less insulation than hard-sided models.

Frame / portable hard-sided tubs use a rigid frame and better insulation for faster heating and lower running costs than inflatables, while still being movable and plug-and-play (MSpa Frame, Oslo, Cocoon, and Denver models). They're the sweet spot for buyers who want durability and efficiency without a permanent installation.

Built-in acrylic spas are the premium, permanent option — molded seating, powerful jets, strong insulation, and a look that anchors a backyard (Empava luxury spas). They cost the most and are meant to stay put, but they deliver the longest life, the best hydrotherapy, and true resort-quality soaking.

Wood-fired hot tubs (SaunaLife) heat with a wood stove instead of electricity — off-grid capable and beautifully rustic, with no electric heating bill, at the cost of tending a fire to warm the water.

Size and Seating

Hot tubs are rated by how many adults they seat, and our lineup runs from two-person up to seven-person models. Size for how you'll actually use it, and account for the reality that "6-person" means six seated shoulder-to-shoulder — for comfortable lounging, that's often four. 2–4 person: couples and small households, easiest to fit and heat. 5–6 person: the most popular family and entertaining size. 7 person: for regular gatherings. Remember that a bigger tub holds more water, which costs more to heat and takes longer to warm up, so don't oversize beyond your real use.

Power, Heating, and Temperature

Most electric hot tubs run on a standard outlet (many MSpa models are plug-and-play 120V), while larger built-in spas may need a dedicated higher-amperage circuit — confirm the electrical requirement before you buy so you can budget an electrician if needed. Heat-up time varies with insulation and outdoor temperature; our models reach temperature in roughly 30 minutes to 2 hours depending on type, with hard-sided and built-in units heating faster and holding heat better than inflatables.

On temperature: hot tubs are adjustable, typically across an 80–104°F range. For safety, 104°F is the maximum recommended water temperature — going hotter risks overheating, and pregnant users, children, and anyone with a health condition should soak cooler and shorter. A well-insulated tub holds your set temperature efficiently between uses.

Jets, Features, and Running Costs

Beyond the basics, a few features shape the experience. Jets and bubbles: more and better-placed jets mean stronger hydrotherapy — inflatables usually offer air bubbles, while frame and built-in spas add targeted hydro-jets. Insulation: the single biggest driver of running cost — better insulation means the heater cycles less, so hard-sided and built-in tubs are cheaper to run despite higher upfront cost. Filtration and water care: look at filter type and ease of maintenance. Extras: LED lighting, app control, and covers (a quality insulated cover dramatically cuts heat loss and is worth prioritizing). Factor the ongoing cost of electricity, water, and chemicals into your budget, not just the sticker price.

Installation and Placement

Every hot tub needs a level, load-bearing base — a filled tub full of people is extremely heavy, so a reinforced deck, concrete pad, or paver base is required, especially for hard-sided and built-in models. Plan for a nearby power source, drainage for water changes, and clearance to access the equipment. Inflatables are the most forgiving on placement; built-in acrylic spas should be sited carefully since moving them later is a major job. Check any HOA or local rules before installing a permanent spa.

Water Care and Maintenance

A hot tub is a small body of heated water, so water care is part of ownership. Plan to test and balance the water regularly — sanitizer (chlorine or bromine), pH, and alkalinity — to keep it clear and protect the equipment; test strips make this a two-minute task. Clean or replace filters on the manufacturer's schedule, and drain and refill the tub periodically (how often depends on use and size). An insulated cover is the highest-value accessory: it slashes heat loss, keeps debris out, and cuts your running cost. Inflatable models are the simplest to maintain and store; hard-sided and built-in spas hold water longer and heat more efficiently but reward a consistent care routine. Budget a modest amount for chemicals and filters alongside the electricity to run it.

Hot Tub Type Comparison

Our Recommendation

For first-timers, renters, or a tight budget: an MSpa inflatable delivers the hot-tub experience with a plug and an afternoon of setup. For the best everyday value: a frame/hard-sided model heats faster, costs less to run, and lasts far longer while staying movable. For a permanent backyard centerpiece and real hydrotherapy: a built-in acrylic spa is the long-term investment. For off-grid or rustic charm: a wood-fired tub skips the electric bill entirely. Size to your real use, confirm the electrical and base requirements, and always keep the water at or below 104°F.

Browse Hot Tubs at Urban Supply

Explore the full hot tub collection to compare MSpa inflatable and frame models, built-in spas, and wood-fired options. Pair hot-and-cold contrast into a home wellness setup with our saunas, or explore bathtubs for indoor soaking. Orders over $299 ship free, with authorized-dealer pricing and US-based support.

Related Urban Supply buying guides: Home Sauna Buying Guide · Outdoor Fireplace Buying Guide · Fireplace Insert Buying Guide