Keeping a Caravan Warm in Winter Without Running Up the Bill
Most advice about keeping a caravan warm in winter is really advice about buying a bigger heater. That is the expensive answer. A touring caravan is a lightweight box with large windows and a thin floor, and the heat you are paying for leaves through those surfaces faster than through anything else. Slow the losses down and a modest heater on a low setting will hold the van comfortable all evening.
This is the order to work through, cheapest and highest-return first.
1. Windows, because they lose the most
Caravan windows are acrylic, usually double-skinned but thin, and they represent a large proportion of the wall area. They are the single biggest heat loss route in the van and the first place condensation appears.
- Close blinds and curtains as soon as it gets dark. The trapped layer of still air between the blind and the glass does real work.
- Thermal window covers, internal or external, are the highest-return purchase in a winter caravan. External covers also keep frost off the outside.
- Do not push furniture or cushions tight against the glass, as that stops warm air reaching the surface and encourages condensation behind them.
- Check the seals. A perished window seal is both a draught and a leak.
2. The floor, because you are standing on it
The floor is a large uninsulated surface with cold air moving under it. Comfort is disproportionately affected by foot temperature, so this is the cheapest way to feel warmer without turning anything up.
- Put a rug or thick mat down in the living area.
- Use a skirt around the base of the van to stop wind moving under the floor. This makes a noticeable difference on an exposed pitch.
- Keep the heater's outlet unobstructed and directed along the floor rather than at the ceiling, since warm air rises on its own.
3. Draughts
A draughty van never reaches its target temperature, so a thermostatic heater never switches off and you pay the full rated figure all evening. Sealing draughts is what lets the thermostat start saving you money.
- Check the door seal all the way round and use a draught excluder at the bottom.
- Look at the locker doors on outside walls, service hatches and the fridge vents.
- Do not block the fixed roof and floor ventilators. Those are there for safety and for damp control, and sealing them causes more problems than it solves.
The distinction matters: you are eliminating uncontrolled draughts, not eliminating ventilation.
4. Heat the space you are in
Heating an entire caravan to keep one end of it comfortable is straightforwardly wasteful. Close the washroom door, close off the bedroom during the evening, and concentrate the heat where you are sitting.
A compact fan heater is well suited to this because you can put it where you are. The Ceramic Heater MKK-100 is 19 x 17 x 26 cm and 1.2 kg, so it moves easily from the living area in the evening to the bedroom end before bed.
5. Run it low and continuously, not high and intermittently
This is the habit that saves the most and it costs nothing. Every time you let the van go cold, the walls, floor, furniture and water all cool with it, and you pay to warm that mass back up. Cold surfaces also collect condensation.
A steady low background heat, with a thermostat cycling the element, keeps the whole structure warm and uses less energy over an evening than repeated hard reheats. A heater with several settings is what makes this possible. The Ceramic Heater MKK-230 has 500W, 1,000W and 1,500W steps plus an adjustable thermostat: use 1,500W to bring the van up from cold, then drop to 500W or 1,000W and leave it there.
6. Manage moisture, because damp air feels colder
Humid air carries heat away from your skin faster than dry air, so a damp van feels several degrees colder than the thermometer says. Reducing moisture makes the van feel warmer at the same setting.
- Lids on pans, always.
- Do not dry clothes inside the van.
- Ventilate in short deliberate bursts twice a day rather than leaving a window permanently cracked.
- Wipe the windows down in the morning.
Note that this is one place where electric heating has a real advantage: a resistive element adds no water to the air, whereas a flueless gas heater produces water vapour as it burns.
7. The things that are not worth doing
- Buying a bigger heater. On a UK hook-up you are limited by the pitch supply, not by the heater. A 3kW heater you cannot run is not an upgrade.
- Blocking the fixed vents. It causes damp and, with any gas appliance in the van, it is dangerous.
- Leaving a fan heater running unattended overnight. Use the van's own thermostatic heating system for that if you have one.
- Chasing efficiency claims between electric heaters. They are all essentially 100% efficient. The differences are in how the heat is delivered, not in how much you get per unit.
What this adds up to
Blinds closed, a rug down, draughts sealed, doors closed on unused areas, and a thermostatic heater held on a low setting. That combination will keep a touring caravan comfortable through a British winter evening on around 500W to 750W, which is roughly 15p to 23p an hour at an example metered rate of 30p per kWh, and leaves plenty of your hook-up allowance for cooking.
Skip the preparation and you will be running the same heater at 1,500W all evening for the same comfort, at three times the cost, with condensation on every window.