How to Handle Water Access for a Wood Fired Hot Tub

One of the first questions we hear from customers with remote properties is: how will I fill a hot tub with no running water and no pump hookup?

It is a fair concern, and twenty-five years of building and installing tubs in off-grid locations across Canada and beyond have shown it is entirely solvable. The question is not whether you can source water without a hose. It is which method suits your property: lake, river, ocean, rainwater, or trucked supply.

Key takeaways

• Water access at a remote property is a logistics question, not a reason to rule out a wood fired hot tub
• The right fill method depends on what is nearby. Natural sources, stored rainwater and trucked supply all have practical solutions
• Cold-weather sourcing takes more planning but needs no specialist equipment
• How you treat the water going in determines what you can do with it when you drain it

Where the water comes from

The simplest approach is to draw directly from your natural environment. With untreated water from a clean source, it is also the most sustainable.

Lake or river

The most common source at a remote property. The main variable is elevation rather than volume: the higher the tub sits above the waterline, the more pump power you need. Run an inline hose filter before water enters the tub to reduce sediment.

We don't have running water in the winter so we fill it from the lake with a gas powered pump, and best of all when we're done for the weekend all that's required is to drain the water and cover. No plumbing to pump antifreeze into. So simple and easy.

Ryan Coleman

For a property doing exactly this, Cabin on the River in the Catskills sits on the water it fills from, and its guests describe what that setup is like in practice.

Ocean water

For coastal properties the ocean is an almost unlimited supply, but not every hot tub handles it. AlumiTubs are built from 5052 marine-grade aluminum, the same alloy specified for boat hulls, which makes them suited to it. Most cedar and plastic-lined tubs are not.

Ocean fills are changed every five to seven days rather than left standing, and the tub is rinsed between fills. On an Electric or Hybrid intended for ocean water, a titanium heating coil is specified at the time of order, so raise it before the build starts. More in saltwater against freshwater.

Well or rainwater tank

Well water works fine, though it often carries high mineral content, including calcium, magnesium or trace metals like copper, which affects water chemistry over time. Use a hose filter before filling.

Rainwater is naturally soft and free, but storage is the challenge. You need a cistern or elevated barrel large enough to hold a full tub. A 1,000 square foot roof collecting 1.2 inches of rainfall at 85% efficiency yields roughly 650 gallons.

One caution with very soft water: low calcium hardness leaves water chemically aggressive toward aluminum. Test rainwater and soft well water on filling, and raise hardness deliberately into the 150 to 250 ppm range.

Trucked or jugged water

If your property has no natural source, delivery works anywhere. A quality hose filter and attention to water chemistry will extend the life of each fill considerably.

See how AlumiTub owners reach remote properties.

How to fill when there is no hose

Submersible pump and hose

The standard approach for filling from a lake or river. A 1/3 HP submersible pump drops into the water source and pushes water through a hose to the tub, flowing at roughly 40 gallons a minute, which puts a full fill at around thirty minutes with a good hose.

If the tub sits well above the waterline, or you are running across seventy feet or more of shoreline, use a 1 inch lay-flat hose rather than a standard garden hose to hold flow rate over the distance.

12V solar pump

A 12V DC solar pump runs silently off a panel and battery bank, draws no fuel, and can be set to fill the tub before you arrive. Some owners have moved from a generator to a 12V solar system for exactly this reason. The pump can connect to the drain kit for a bottom-up fill, which is more efficient than filling over the rim. If you spend regular time at the property, this is the setup worth building toward.

Generator-powered pump

Where solar is not viable, or winter compromises battery performance, a generator-powered pump is the reliable fallback. Louder and fuel-dependent, but it works in extreme cold when other systems struggle, which makes it the go-to for winter fills.

Gravity fed from an elevated tank

A storage tank above the tub lets gravity do the work with no power at all. Fill rates are slower than a pump, so this suits top-ups better than filling from empty. Paired with a cistern large enough for a full fill, it is a completely off-grid water system with no moving parts.

Filling in winter when the source is frozen

Cold weather does not stop the soak. It changes the process.

When the lake is frozen over, cut a hole through the ice and pump from beneath. AlumiTubs owner Kevin MacLean has done exactly this at temperatures as low as minus twenty-one degrees Celsius, cutting through with a chainsaw or ice auger and lowering a submersible pump into the water below.

Plan for ice that can exceed two feet thick in northern climates. Once the fill is done, drain or blow out the hose immediately. Water left standing in a hose at minus twenty will freeze and block it.

If you would rather not cut ice, a stock tank heater or pond de-icer in a storage tank keeps a supply liquid through winter. Water stored that way should be tested and balanced before use, depending how long it has been sitting.

Know your capacity before planning a winter setup. AlumiTubs hold 315 gallons on the Small, 420 on the Standard and 650 on the Large.

How often you actually need to refill

Less often than you would expect.

A well-insulated tub retains heat between soaks, and your water care approach determines how long the water stays clean. For a weekend at the cabin, or a few days of soaking, water can go in and come out with no treatment at all.

Remote property owners often try to use water from their natural environment. When the tub is filled from a natural source and left untreated, it can be released back afterwards without consequence, conserving resources and working with nature rather than against it. That fresh-fill simplicity is a very elemental way to experience a hot tub.

Laura, AlumiTubs co-owner

Ocean fills change every five to seven days. Fresh fills held longer need a water care routine: how often you should change hot tub water covers the intervals, and adding filtration extends a single fill to three to four months.

What to do with the water after

Connect a garden hose to the drain kit and run it wherever you want the water to go.

If you have used no treatments, untreated water from a natural source goes straight back where it came from: lake, river, ocean or garden bed.

If you have added bromine, neutralize the water before draining anywhere near a natural body of water, since active sanitizers are toxic to aquatic life. Check the level with test strips, add a sodium thiosulfate neutralizer, and retest after fifteen minutes. Once it reads clear, drain onto vegetated ground where water can filter through soil before reaching groundwater.

The fill-and-drain approach, which most owners at remote properties prefer, skips this step entirely.

Never drain below the fill line until the firebox has fully cooled.

Water access is a solvable problem

It is a logistics question, not a reason to rule out a wood fired hot tub. Lakes, rivers, ocean, rainwater and trucked supply are all workable. The method changes with the site. The outcome does not.

AlumiTubs are built from marine-grade aluminum that handles ocean water and natural sources, with no plumbing to winterize and no special treatment required. Reserve now, pay later, with your ship date assigned at order.