James Ashworth
Why Winter Hits a Narrowboat Harder
A steel hull sitting in cold water is a heat sink with a roof. Water draws warmth out of metal far faster than air does, and the narrow shape of a boat means there is very little bulk between you and the outside world. Add single-glazed windows, a roof that frosts on the inside, and condensation forming wherever warm damp air meets a cold surface, and you have the classic winter aboard experience: a boat that feels chilly an hour after the fire has gone out.
The good news is that keeping warm is mostly about three things — trapping heat, stopping draughts and getting moisture out — plus one heat source that is working properly. Diesel heating is convenient and it will do the job, but running a diesel boiler hard from October to March is one of the quickest ways to empty your wallet. Most liveaboards who stay genuinely comfortable through the winter treat a solid fuel stove as the main event and everything else as backup.
Start With Insulation, Not Fuel
Every pound spent on insulation saves several on fuel, and it keeps saving year after year. Spray foam applied to the hull sides and under the roof is the gold standard, but plenty of older boats were built with minimal insulation and still manage well once the weak spots are dealt with.
Focus on what you can actually reach:
- Behind wall panels, especially the lower sections where cold creeps up from the waterline.
- Under the floor and inside bow and stern lockers that sit against the cabin walls.
- Ceilings — a layer of foil-faced bubble insulation tucked behind the lining makes a noticeable difference.
- Bedding areas, where a cold hull side against your shoulder ruins a good night's sleep.
Add thick thermal curtains, a heavy wool blanket across the side hatch, rugs or carpet tiles over a bare ply floor, and you will feel the benefit within a day.
Stop the Draughts Before You Light the Fire
Draughts are the cheapest problem to fix and the results are immediate. On a cold day, walk around with the back of your hand held close to the surfaces, or use a lit candle carefully, and you will soon find the culprits.
- Side hatch doors and their frames — foam or brush strip works wonders.
- Front and rear doors, particularly along the bottom edges and around the hinges.
- Window frames and any opening panes. Magnetic secondary glazing film is cheap, removable and remarkably effective.
- Around the chimney collar, where hot air escapes and cold air sneaks in.
- Floor hatches and weed hatch covers inside the cabin.
One important balance: seal draughts, not airflow. Your stove needs a steady supply of air to burn safely, and the boat needs ventilation to keep condensation under control. Keep at least two roof vents open, even in the depths of winter.
The Solid Fuel Stove: Your Winter Workhorse
A small multi-fuel stove of around 4 to 5kW will heat a 50 to 60ft narrowboat comfortably, provided the boat is insulated and reasonably draught-proofed. The key is learning to run it properly.
- Fuel choice matters. Smokeless fuel and anthracite burn long and steadily, and will hold in overnight when the vents are closed down. Wood is lovely, but it must be genuinely dry — under about 20 per cent moisture — or you will coat the flue in tar and get very little heat for your trouble.
- Riddle and empty the ash pan daily when burning hard. Ash building up and choking the grate is the most common reason a stove suddenly loses its appetite.
- Sweep the flue at least once a season, more often if you burn wood. A clogged chimney is both a fire risk and a carbon monoxide risk.
- Fit a carbon monoxide alarm and test it weekly. This is not negotiable on a boat with a solid fuel appliance.
- Learn the air controls. Bottom vents wide open for a quick blaze, then closed down for a slow, overnight burn. A stove packed at bedtime will often still be warm at seven in the morning.
As a rough guide, a well-insulated 50 to 60ft boat in deep winter will get through a 20kg bag of smokeless fuel every four to six days.
Keeping the Damp at Bay
Cooking, showering and simply breathing put several litres of moisture into the air every day. Condensation makes a boat feel far colder than it actually is, and it ruins bedding, cushions and woodwork over time.
- Open a window a crack or run an extractor while cooking and showering.
- Wipe down windows and frames each morning before the water runs onto the wood.
- Keep mattresses off cold hull sides with a layer of insulation or a folded blanket underneath.
- Avoid drying washing inside unless you can ventilate properly.
- Steer clear of unvented paraffin or gas heaters — they pump out moisture as fast as they pump out heat.
Small Habits, Warm Mornings
Warm the bed rather than the whole boat: hot water bottles and a fleece liner cost pennies and make a huge difference. Dress in layers, and heat the space you are actually sitting in — closing the bedroom door off while you are in the saloon concentrates the warmth where you need it. Keep the fire in overnight, and get into the routine of lighting it first thing with the kettle on while the cabin comes back to life.
Do all of this and winter aboard stops being an endurance test. Frosted towpaths at dawn, mist rolling off the water and a stove ticking over in the corner — there are few better places to be. Get the insulation, draught-proofing and ventilation right, and the coldest months become the ones you look forward to most.
