Getting a Hot Tub Through a Wisconsin Winter

A hot tub is at its best on a cold night, and here that means a lot of nights. Wisconsin winters are also hard on equipment. The air temperature drops below zero and stays there, and a tub that is sitting outside with water in its plumbing needs three things to keep going: steady power, a cover that holds heat, and an owner who notices when something is off. Here is how to keep it running, and what to do if it stops.

The real risk: power loss in deep cold

A running hot tub protects itself. The heater and circulation keep water moving and warm. The danger is when the power goes out during a severe cold snap, because then nothing is heating or moving the water. The water in the plumbing lines is the first to be at risk, since those lines are small and exposed compared to the big volume of water in the shell. If the water in the pipes freezes, it expands, and that can crack fittings, plumbing, and equipment.

How quickly this happens depends on the temperature, the wind, the cover, the insulation of the tub, and how full the tub is. There is no safe time you can count on. If you lose power during a deep freeze and it looks like it will be a long outage, treat it as an emergency for the tub, not just an inconvenience.

What to do when the power goes out

Keep the cover on and latched. Do not open it to check, because every opening lets out heat you cannot easily replace. If you can safely restore power with a generator, do it only by following the manufacturer's directions and making sure the electrical connection is safe. If you are not sure, do not improvise with a hot tub and electricity.

If the tub was off long enough that you suspect it froze, do not just flip the breaker back on and hope. Running a heater and pump against ice can do more damage than the freeze did. Call us at (608) 783-4477 and describe what happened. Often the right next step is to let someone look at it first. We repair hot tub equipment, find and fix leaks, and repair plumbing, which are the three things a freeze tends to break.

The cover is half your winter defense

A hot tub cover is not an accessory. It is the lid on your heating bill. A good cover traps heat and keeps snow, ice and debris out of the water. A tired cover does the opposite. When the foam inside a cover absorbs water, it gets heavy, loses its insulating value, and stops holding heat. If you lift the cover and it feels soggy or much heavier than it used to, or if the vinyl is cracked, torn or sagging in the middle, it is time to think about a new one.

We keep many covers in stock, tailored specifically for Sundance Spas. That means if yours fails in the middle of January, you do not have to wait weeks for a custom order. Covers are insulating, durable, and built to protect from debris. A tailored fit matters because a cover that does not seal at the edges leaks heat all winter.

Habits that keep a tub healthy in the cold

• Check the water level every week or two. A low level can let the heater run dry or let the pump pull in air.
• Keep the area around the tub clear of drifted snow and ice, so air can move and you can reach the equipment cabinet.
• Listen for new noises. A pump that screeches or a heater that clicks without heating is telling you something.
• Look under and around the cabinet for drips or ice. A small leak in winter turns into a big one fast.
• Keep up with water care. Cold water and a closed cover can hide problems, so test regularly.

When to call for repair

Call when the tub will not heat, when it will not hold temperature, when an error code keeps returning, when you see water where there should not be any, or when a jet or pump stops working. Call before you try a second reset and a third. Repeated restarts rarely solve a real fault, and they can stress the parts that are still working.

Our hot tub service covers equipment repair and replacement, leak detection and repair, and plumbing repair. Leaks are the tricky ones. A slow leak can hide behind panels, and the sooner it is found, the smaller the repair tends to be.

Planning ahead, so a cold snap is not a crisis

Think about the outage before it happens. Know where your breaker is. Know how to find the equipment cabinet. Keep our number by your phone. If you are going to be away for a long winter trip, ask someone to check on the tub, because a failure that nobody notices for a week can become a very large problem.

If your tub is getting old and you are thinking about what to do with it, our Sundance page at /sundance-spas-hot-tubs shows the current lineup, and our repair page at /maintenance-pool-repairs-care lists what we fix. Stop by 1001 12th Ave South in Onalaska, or call (608) 783-4477, and we will help you work out the best plan for your tub.