Heat an Empty Cottage All Winter, or Drain It? A Decision Guide

The real fork every cottage owner faces

Every fall, once the docks are out and the boat is put away, cottage owners on the Bruce and along the Lake Huron and Georgian Bay shore land on the same question: do you keep the place heated all winter, or shut it down cold and drain everything?

There is no single right answer. But there is a right answer for your cottage, and it comes down to three things — how the building is built, how often you will actually visit, and how reliable your hydro is once the storms roll in. Here is an honest look at both strategies, the hybrid that sits between them, and how to figure out which one fits.

Strategy A: drain it down and let it sit cold

The first approach is a full winterization. You drain every water line, empty the tanks and traps, treat the plumbing with non-toxic antifreeze, and then walk away with the heat off — some owners cut the power at the panel entirely.

The appeal is simple. With no water left in the lines, there is nothing for a freeze to find, and you are not depending on the furnace to keep running or the hydro to stay up all season. That is what makes a full drain-down the lowest-risk approach for the plumbing itself — a cold, dry building has no water in it for a freeze to reach. For a cottage that sits empty for months down a quiet rural line, that takes the biggest winter worry off your plate before the season even starts.

The trade-off is that the cottage is genuinely closed. You cannot drive up for a January weekend and turn on the tap. Getting the place usable again means re-commissioning the water system in spring — priming the pump, refilling the lines, and checking for the fitting that always seems to weep after a season of sitting.

Strategy A tends to fit when:

• Your cottage is a 3-season camp that was never really built for deep winter
• You do not plan to visit between closing and the spring thaw
• Your stretch of shore loses hydro for hours or days after big storms
• You would rather not depend on power, internet, and a furnace all holding for five straight months

Our plumbing winterization service is built around exactly this — every line drained and blown out, every trap and toilet treated, and each step logged so nothing gets missed.

Strategy B: keep low heat and leave the water on

The second approach keeps the cottage alive through winter. The furnace stays on at a low setting — many owners use somewhere around 10°C (50°F) — the water stays connected, and the place is ready to use whenever you drive up.

For a properly winterized four-season cottage that you actually visit in winter, this is the comfortable option. No re-commissioning, no cold-camping. You arrive, the heat is already on, and the shower works.

But this strategy quietly changes the risk. With the water still in the lines, you are now depending on two things that have to hold, unattended, for months: the power staying on, and the furnace staying lit. If either one fails during a cold snap, the building starts cooling toward the outside temperature, and any water in the plumbing is suddenly exposed to freezing. The hard part is that nobody is there to notice. A furnace that quits on a Tuesday night, or a hydro line that goes down in an ice storm, becomes a freeze event that no one sees until they open the door in spring.

This is worth being blunt about. A cottage on a rural line takes the wind and snow straight off Lake Huron, and those lines go down every winter. A dead furnace in a house you are living in is an annoyance you notice within the hour. In an empty cottage with charged water lines, it is the exact chain of events that floods a place.

Strategy B tends to fit when:

• Your cottage is fully winterized and built to be heated year-round
• You visit through the winter and want it usable the moment you arrive
• Your hydro is reliable, or you have a generator or backup heat source
• Someone is checking on the place, or monitoring it, so a failure cannot run unnoticed for weeks

The hybrid: drain the water, keep a little heat on

There is a middle path a lot of owners settle on, and it is often the smartest of the three: drain the plumbing completely, and keep a low heat running in the building.

At first that sounds contradictory — why heat a cottage with no water in it? The reason is the building itself. Draining the lines takes the plumbing-freeze risk off the table. Keeping a low, steady heat is for the sake of the structure and its finishes: the drywall, trim, flooring, and cabinetry that do not love swinging through months of deep cold and the damp that rides along with it. In effect, you get the plumbing peace of mind of Strategy A with a gentler ride for the building.

The hybrid still leans on the power staying on, so it is not fully independent of hydro. But because the water is already drained, a furnace failure or an outage is no longer a burst-pipe emergency — it becomes a comfort-and-finishes question, not a flood one. For a lot of four-season cottages that only get the occasional winter visit, that is the sweet spot.

Side by side, the three strategies compare like this:

How to actually decide whether to heat or winterize

Strip away the labels and the decision really comes down to three honest questions about your specific place.

How is the cottage built? A true four-season cottage — insulated, sealed, with a heating system meant to run all winter — can carry low heat comfortably. A 3-season camp with thin walls and a woodstove was never designed for it, and trying to heat it all winter is an uphill battle, with the warmth pouring out about as fast as you put it in. Match the strategy to the building, not to the wish.

How often will you really visit? Be honest here, not optimistic. If the cottage is going to sit untouched from November to April, the usability of Strategy B is a benefit you will never actually collect — and you would be carrying its risk for nothing. If you are up most winter weekends, keeping it heated and usable earns its keep.

How reliable is your hydro? This is the one people underweight. Rural shore lines around Sauble Beach, Southampton, and up the peninsula lose power in winter storms — sometimes for a day or more at a stretch. If your line is one of those, leaning on the grid to keep charged water lines from freezing for five months straight is a real gamble. A drained system, whether Strategy A or the hybrid, simply does not care whether the power stays on.

If you are still weighing when to shut things down in the first place, our guide on when to close your cottage on the Grey-Bruce and Huron shore walks through the timing. And we look after cottages right across Bruce County whichever strategy you land on.

What your insurance may expect

There is one more input that is not about the building at all: your insurance. Many home and cottage policies carry specific expectations for a vacant building over winter, and the wording often hinges on exactly this heat-versus-drain choice.

Some policies expect a heated building to be kept at a minimum temperature and checked on a set schedule. Others are written around a fully drained, shut-down building. A few spell out how often someone has to physically look in on the place while it sits empty. Landing on the wrong side of that wording is not something you want to discover after a claim.

We are not insurance experts, and every policy is different, so the only safe move is to read your own policy wording or ask your broker before the season — rather than assume your setup ticks the box. It is a five-minute call worth making before you commit to a strategy.

How checkups change the math for Strategy B

Here is the piece that often tips the decision. The whole weakness of keeping heat and water on is that a failure runs unseen. That weakness shrinks a great deal when someone is actually laying eyes on the place through the winter.

A smart thermostat or a Wi-Fi temperature sensor helps — it can text you if the inside temperature drops. But it only works while the power and the internet are both up, which is exactly the moment a winter storm tends to take them down. The alert you most need is the one that cannot get out.

A person is different. On a winter checkup visit we confirm the furnace is still running and the inside temperature is holding, look for the early signs of a leak or a frozen line, and if something is off, you hear about it fast — with photos and a plain explanation, not a silent gap until spring. For an owner running Strategy B, a regular checkup is what turns “a failure nobody sees” back into “a failure someone catches early.” It does not remove the risk of leaving the water on, but it changes the odds that a problem runs for weeks before anyone knows.

A sensor and a person guard against the same failure very differently:

Not sure which way to go? Let’s talk it through

Most owners land on the hybrid or on a full drain-down, and honestly, the best choice is the one that lets you sleep through a February windstorm without lying awake wondering about your furnace. If you want a hand deciding, we do this every week, up and down the shore.

We will handle the full plumbing winterization if you are draining down, set you up with winter checkups if you are keeping heat on, or do both for the hybrid. Tell us how your cottage is built, how often you get up, and how your hydro behaves, and we will walk you through what makes sense for your place — with a clear quote up front.

Give us a call at 519-783-1575. The phone is answered 7 days a week.