Look for bottles made to BS 1970, the UK safety standard. Cheap, thin bottles perish and split — a quality natural-rubber bottle lasts years.
A fleece or knitted cover slows heat loss, extends warmth by hours and prevents burns from direct skin contact. Buy the bottle with a cover, or add one.
2 litres holds more heat for longer and suits a bed or armchair; a 1-litre bottle is lighter and easier for children or to tuck against the body.
A wide neck is easier and safer to fill from a kettle, and a well-seated stopper is what stops leaks. Check the stopper each season and replace a perished bottle.
Use hot but not boiling water (around 80°C) and fill only two-thirds full. Boiling water degrades the rubber and raises the risk of splitting or scalding.
Always use a cover or wrap it in a towel. Prolonged direct contact can cause low-temperature burns, especially on people who cannot feel or move away from the heat.
Rubber degrades. Check for cracks, discolouration and a soft, sticky feel, and replace any bottle more than a couple of years old before you rely on it in winter.
A simple, honest bit of warmth backup that needs nothing but hot water — useful when the heating fails or you're trying to keep a room's costs down. A full 2L bottle holds heat for hours in bed or on your lap, and the knitted cover stops it scalding. Cheap insurance for a cold snap.
A simple, effective 2-litre hot water bottle with a soft removable cover. When the heating is off, a hot water bottle warms a bed or a chair using nothing but boiled water — the cheapest, safest way to stay warm through a cold night without power.
A standard 1-litre natural rubber hot water bottle with a soft fleece cover, and one of the cheapest ways to stay warm through a winter power cut. Boil a kettle on a camping stove, fill it, and it holds heat for hours in a bed or on your lap without drawing a single watt. Simple, reliable warmth that belongs in every cold-weather kit.
An inexpensive rectangular 3-season bag that's a sensible warmth backup for a car, caravan or home emergency stash rather than serious winter camping. It packs down into an included sack and gives you a warm layer if the heating fails. Rated for milder conditions, so pair it with extra layers or a liner for genuinely cold nights.
A lightweight down-filled mummy sleeping bag that stuffs down small enough to live in a grab bag or the bottom of a rucksack. Down gives a good warmth-to-weight ratio for its packed size, making it a sensible backup for cold nights, power cuts or an unplanned stopover. Keep it dry, as down loses loft when wet, and it will hold its warmth well.
A roomy two-person bag with a built-in pillow and hood from a trusted British outdoor brand, rated as a 2–3 season bag for milder camping and festivals. It also doubles as a warm, packable layer to keep by the sofa or in the loft for a winter power cut, when keeping two people warm together is more efficient than heating a room. It's bulkier than a solo mummy bag, so treat it as home or car kit rather than something to carry far.
A merino-blend long-sleeve top and long johns designed to trap warmth and wick moisture next to the skin. Merino stays warm even when slightly damp and resists odour over several days, which makes it a strong base for a cold power cut, a winter walk or a car left stranded in bad weather. Danish Endurance is a well-reviewed outdoor-basics brand.
A pair of rechargeable hand warmers with three heat settings that clip together magnetically, and each one doubles as a small 5,000mAh power bank for a phone top-up. Reusable is the sensible long-term choice over disposable sachets if you are out in the cold regularly or facing a winter power cut. Both charge and discharge over USB-C.
A proper technical base layer from a trusted Norwegian outdoor brand. The Lifa fabric wicks sweat off your skin and keeps warming even when damp — the difference between staying comfortable and getting a dangerous chill when you're cold and inactive during a power cut or out in winter weather.
Single-use or reusable heat packs that provide warmth for 6–12 hours. Critical for preventing cold injuries.
A wool blanket keeps you warm even when damp and won't melt near a flame — the rugged, reusable warmth layer for a cold house, a stranded car or a night outdoors.
Insulated sleeping bag rated for cold temperatures. Essential for any overnight emergency or planned outdoor stay.
A close-fitting top and leggings worn next to the skin that trap warmth and move sweat away — the foundation of staying warm outdoors or through a cold power cut, and far more effective than piling on cotton.
Compact thermal blanket that reflects up to 90% of body heat. Weighs under 60g and fits in your pocket.
A good stainless flask keeps drinks and food hot for the best part of a day with no power at all — a hot brew in a cold, dark house does more for morale than almost anything.
