Plug-and-play hot tubs

A plug-and-play hot tub (also called a 110-volt or 120-volt hot tub) is a hard-shell tub that runs on a standard household voltage instead of a dedicated 240-volt circuit. It plugs into a dedicated, GFCI-protected outlet, which makes the electrical side of the installation simpler, at the cost of slower heating and less power to run the heater and jets at the same time.

What "plug and play" means

A full-size hot tub is normally hard-wired to a 240-volt circuit with its own disconnect, sized to the tub (see hot tub electrical). A plug-and-play tub skips that. It comes with a cord and plugs into an outlet on its own circuit, usually 15 or 20 amps depending on the model. The manual will say exactly what it needs.

Two rules don't bend:

• The outlet must be dedicated and GFCI-protected. Nothing else should share that circuit, and the outlet must suit outdoor use and be placed where the code allows. If you don't have one in the right spot, a new outlet is still electrical work that needs a licensed electrician and a permit.
• Never use an extension cord. Hot tub makers prohibit it. Extension cords overheat under a long, steady load and add a connection that can get wet.

How they heat in a Fraser Valley winter

At 120 volts, the heater has much less output than on a 240-volt tub. On many models the heater also pauses while the jets run on high, because the circuit can't carry both at once. In practice that means:

• The first heat-up after filling takes longer, often a day or more.
• Long soaks with all jets on high can let the water cool a little, and it recovers more slowly afterwards.
• On a cold, windy night the tub works harder to hold temperature.

Plug-and-play owners who are happy with their tubs tend to do the same few things: keep the temperature set where they like it rather than turning it up and down, keep a good, tight cover on whenever the tub isn't in use, and run the jets on low when the tub is cold outside. Good insulation matters even more on a 120-volt tub than on a 240-volt one, so it's worth asking how a model is insulated before you buy.

Some plug-and-play models can be converted to 240 volts later, which speeds up heating and lets the heater run with the jets. Not all can, so check the model if you think you might want that one day.

Sizes and seating

Most plug-and-play tubs are smaller, roughly 2 to 4 people, because a bigger volume of water is hard to heat on 120 volts. That fits well with a small patio, a townhouse yard or a deck with limited room. If you're looking at 2–3 person hot tubs, a plug-and-play model is often one of the options worth comparing. For larger families, a 240-volt tub is usually the better choice.

Who plug-and-play suits

• Small yards and decks, where a compact tub fits better anyway
• Homes with no spare room in the electrical panel for a 240-volt circuit
• Renters and second homes, where a hard-wired circuit isn't practical
• A first hot tub, for people who want to see how often they'll use it

It's less suited to people who want long, hot soaks with every jet running, or a large tub for six or more.

Plug-and-play vs inflatable vs 240-volt

An inflatable is the cheapest way in, but it holds heat poorly in our winters. Our guide to inflatable vs hard-shell hot tubs goes through the trade-offs. A plug-and-play tub gives you a proper insulated shell without the 240-volt circuit.

The base still matters

Even a small tub weighs a lot once it's full of water and people. It needs a level, solid base that drains, such as a concrete pad, compacted gravel or a deck designed for the load. See hot tub pads and bases.