Holiday Home Frost Precautions: Keep Pipes Safe While You’re Away

Going away for a few days in autumn or winter? A cold snap can freeze pipes in empty homes, garages and holiday cottages around Clare, Sudbury and the villages nearby. The safest frost precaution for most homes is to leave the heating on a low background setting, protect outside taps and loft tanks, and make sure you can turn the inside stopcock if something goes wrong. Only drain unused pipe runs if you fully understand the system — and never open a boiler casing or touch gas controls.

Decide: leave heat on, or isolate unused runs

Anglian Water’s winter advice is clear: if you’re going away in cold weather, leave the central heating on low so some warmth stays in the pipes. That is usually safer than draining a whole heating system you do not understand. Draining a sealed (pressurised) heating system, or a boiler you are not trained on, can cause airlocks, damage and a cold house when you return — so treat a full drain-down as a job for a heating engineer unless your insurance and boiler manual specifically tell you otherwise for a simple cold-water branch.

Check your home insurance small print too. Some policies ask you to keep a minimum temperature, leave heating on, or tell them if the property will be empty for more than a set number of days.

Your holiday frost checklist

1. Set safe background heat. Put the room thermostat and programmer on a low constant or timed setting so the house does not drop to freezing. Follow the boiler and thermostat manuals for frost or holiday modes if your controls have them. Do not remove covers, adjust gas valves or open the boiler casing — only a Gas Safe registered engineer may work on gas appliances.
2. Clear the external condensate pipe route. Condensing boilers send waste water out through a small plastic pipe. Leaves, snow or ice on that outdoor run can freeze and lock the boiler out. Keep the end clear and free of blockages. If it freezes while you are away, thaw it with warm (not boiling) water when you return, then reset only as the manufacturer’s user manual allows. Our guide covers a frozen boiler condensate pipe.
3. Protect the outside tap. Take the hose off, turn off the indoor isolation valve if you have one, open the garden tap to empty the outdoor pipe, then cover and lag it. Full steps are in our outside tap winter checklist.
4. Look at garages, sheds and outbuildings. Pipes to a washing machine in the garage, a second outside tap or a workshop sink freeze first. Lag them, or isolate and empty that branch if you will not need water there until you are back.
5. Wrap loft tanks and lag cold pipes. If you have a cold-water tank in the loft, fit a proper tank jacket (leave the base uninsulated so some warmth can rise). Slip foam lagging on pipes in the loft, under floors and in other unheated spaces. Where pipes sit above loft insulation, consider whether your loft hatch should be left slightly ajar so a little warm air reaches them — Anglian Water notes this can help, but it also wastes heat, so weigh it up for your home.
6. Fix drips before you leave. A dripping tap or running overflow can freeze solid in a cold snap. Sort drips first, or isolate that fitting.
7. Label and test the inside stopcock. Find the main inside stopcock (often under the kitchen sink) and check it turns gently. Do not force a seized valve. Label it so a neighbour or keyholder can shut the water off in an emergency. See how to find and turn off your stopcock.
8. Tell a trusted keyholder what to do. Leave your boiler manual, the stopcock location, and our number. Ask them to check for wet patches, odd smells or a boiler showing a fault after a hard frost.

When a simple drain of unused cold water makes sense

For a short unused cold-water run — for example an outdoor tap branch you have already isolated — emptying that pipe is sensible. For a whole house, Anglian Water describes turning the inside stopcock off and running taps to empty the system. Only do that if:

• you know exactly which taps and appliances will empty,
• you will not leave the heating system in an unsafe or half-drained state,
• and your boiler manual and insurance allow it.

If you are unsure, stop. Call a plumber or heating engineer rather than guessing. Never dig up or force the outside or boundary stop tap — that is usually the water company’s (Anglian Water or Essex & Suffolk Water), may need a special key, and may affect neighbours. Contact the water company about a leak on their side.

Electrics and water while you are away

Unplug portable heaters and garden equipment you will not need. Do not leave high-load heaters running unattended against curtains or furniture. If a trip switch (RCD or MCB) goes off when someone checks the house, they may reset it once from a dry position with dry hands. If it trips again, leave it off and call a registered (Part P) electrician. Never touch electrics near water.

When to stop and call us

• You want the heating or hot-water system checked, lagged or set for a long empty period and you are not confident doing it yourself.
• You need an isolation valve, frost-resistant outside tap or proper lagging fitted before you go.
• A neighbour finds a burst, wet ceiling, or water near sockets while you are away.
• The boiler locks out repeatedly, pressure keeps dropping, or you smell gas.

Our central heating and boiler repair teams can help with safe winter settings and faults. For pipe bursts, see emergency plumbing, and for wet electrics our electrical team. If pipes have already frozen, use our thaw frozen pipes safely guide — warm water or a hairdryer only, never a blowtorch or boiling water.

Smell gas or suspect carbon monoxide? Leave the property, open doors and windows if it’s safe, don’t use light switches or naked flames, turn the gas off at the meter only if it’s safe to do so, and call the National Gas Emergency Service on 0800 111 999. Get medical advice if anyone has CO symptoms such as headaches, dizziness or nausea. Only a Gas Safe registered engineer may work on gas appliances; you can check an engineer on the Gas Safe Register.

Sources and further reading

• Anglian Water: getting winter ready
• Anglian Water: Core Customer Information (frozen pipes and prevention)
• Essex & Suffolk Water: winter weather advice
• Vaillant: condensate pipe winter advice

This is general safety guidance. If you’re unsure, stop and call a qualified engineer.