Hot tub and pool wiring: what it takes

What a hot tub needs

The scenario we see every spring: the hot tub is delivered on a Friday, the slab is poured, everyone is happy — and no power supply has been planned. The seller talked about a “simple” hookup.

It isn’t simple, and above all it isn’t quick: it takes a dedicated circuit, suitable protection, bonding and, often, checking that the panel can keep up. It gets planned before delivery.

A typical outdoor hot tub is a heavy, long-lasting load: a water heater, one or more pumps, a control system. It runs all year, including in January.

In practice, the installation includes:

The exact amperage and the distances to respect depend on the model and the Code in force. Get out your hot tub’s spec sheet before calling us: it gives the amperage, and it changes everything in the estimate.

What a pool needs

A pool is the same principle with a different layout: the equipment is grouped in one place — pump, filter, sometimes a heater or a heat pump — and it has to be powered, protected and bonded.

Two differences from a hot tub:

• The load is often more modest, unless you add a pool heat pump — in which case you’re back in the same range as a hot tub for capacity.
• The area is larger. A pool, a technical shed, lighting, sometimes a shelter. Bonding covers that whole area, not just the equipment.

And an above-ground pool doesn’t escape these rules. It’s cheaper and quicker to install, but it calls for the same electrical rigour.

Bonding

It’s the part of the work no one sees, no one asks for, and that matters most.

The principle. All the metal parts around the pool are electrically connected to each other: the reinforcement, the ladders, the pumps, the enclosures, the motor. The idea isn’t to drain the current away — it’s to make sure everything a wet person can touch is at the same potential.

Why it matters. An electric shock doesn’t come from touching something “live”. It comes from a difference in potential between two points you touch at the same time — a ladder and the bottom of the pool, for example. If there’s no difference, no current flows through the body.

Is your panel enough

It’s the question that derails the most projects, and it almost always comes up too late.

A hot tub adds a significant load, and it has the bad habit of drawing it at the worst time: in the evening, in winter, when the house heating is already running full out. It isn’t the annual consumption that causes the problem, it’s the peak.

The load calculation gives three outcomes, as for an EV charger:

• It works as is. Common on a 200 amp house with no other big addition.
• It works with load management. Two big loads are kept from running at the same time.
• The capacity has to go up. Then the hot tub comes with a panel project, and that changes the budget.

Our guides on the 100 amp panel and the 200 amp panel detail what tips an installation over — the hot tub is among the four deciding loads.

How it goes and what drives the price

The work is done in one visit in most cases, as long as everything has been prepared. The order: load calculation and visit, quote, municipal permit, then the job — breaker at the panel, route to the hot tub, protection, bonding, commissioning.

What makes the bill vary:

• The distance between the panel and the hot tub, and what has to be crossed. A trench in a landscaped yard isn’t a trench in bare ground.
• The amperage required by the model, which sets the cable size.
• The condition and capacity of the panel. It’s the item that can double the project.
• When you call us. Before the slab, everything is simple. After, we work around what’s already there.

Frequently asked questions