This page is that one pipe. The brass tap on the outside wall belongs on the outdoor-tap page. A boiler that will not light because of the programmer, the thermostat or a lockout you cannot explain belongs on the will-not-fire page. A gauge sitting on the floor belongs on the low-pressure page. The oil tank in the garden belongs on the heating-oil page. If a carbon monoxide alarm is already sounding, leave the house. The alarm page is the test you do before a planned fire.
Read the live forecast again before you treat Saturday night as settled. The note below is the Met Office media-centre piece timed at 12:43 (UTC+1) on 9 October 2026. A later warning can move the frost, the showers and the wind. The sort of the pipe does not move with the forecast: a white plastic run to a drain is still condensate, and a brass bib is still the garden tap.
What Saturday night actually says
On Friday the Met Office published Mixed conditions ahead with wind, rain and sunshine in the forecast. Chief Forecaster Andy Page described Saturday as showers feeding in from the north and west, with larger rainfall totals mainly in northwestern parts of the UK. In the south, especially in longer spells between showers, temperatures reach around 15°C. The line that matters for the boiler is the next one. Clearing skies on Saturday evening, from a short-lived ridge of high pressure, bring cooler conditions overnight, with the possibility of frost in more prone spots in northern parts of the UK.
That is a possibility in prone spots, not a frost warning for every street in Britain. A sheltered wall in the south, under the 15°C spells Page described, is a poor candidate for a frozen pipe tonight. A north-facing run in a frost hollow in northern England, Scotland or Northern Ireland is the case this page is for. Prone means the cold can pool: a rural dip, an exposed gable, a pipe that leaves the wall and then sags before it reaches the drain. A city centre that stays above freezing can wait. If your own forecast for tonight stays well above zero, you still only need to know which pipe is which, so a later cold night is not a guess in the dark.
Sunday does not cancel a lockout that happens at 2am. Page’s note says many places then have a dry, bright day, with showers fading, before cloud increases in the west and rain spreads into the southwest later. Temperatures sit close to average, with milder Atlantic air. Strong winds, and maybe coastal gales, are a watchpoint for Irish Sea coasts later on Sunday. Deputy Chief Forecaster Mike Silverstone then describes Monday as a front crossing from the west, with gales possible on coasts and high ground in the north and west on Monday night, and says those conditions are not currently expected to need severe weather warnings. Tuesday looks unsettled, windy and unusually mild, with the warmest spots in eastern and southeastern England likely to reach the low 20s Celsius before cooler air returns.
The useful reading is the gap between those sentences. The frost chance is Saturday night into Sunday morning, in northern prone spots. After that the air turns milder and wetter. Milder Sunday air does not press the reset button on a boiler that shut down while the pipe was frozen. If you are in one of those spots, look at the pipe before you go to bed. If you wake to a dead boiler and a gurgle, the thaw below is the job, even if the grass is no longer white by breakfast.
Which pipe you are looking at
A condensing boiler makes water as it pulls heat out of the flue gas. Worcester Bosch’s frozen-condensate page describes the extra pipe that carries that water away: normally plastic, from the boiler to a household drain or a soakaway. If the run goes outside, you find it leaving the wall under or beside the boiler and heading for a drain. The same page says a drip of condensate while the boiler is working is a sign the appliance is doing that job, and that a long spell of freezing weather can ice the outside length and stop the boiler. Tonight may only be a touch of frost. An uninsulated exposed length can still ice at a bend or a sag. Worcester’s own installation text says the blockage is usually at the most exposed point outside, at an elbow, or where the pipe sags and water can sit.
The same page names two clues on a Worcester Bosch boiler: a gurgling noise, and an EA code on a digital display. Those clues belong to that maker’s description. Another brand uses another code. Read the handbook for the badge on the case. Do not treat EA as a national fault code, and do not take the cover off to hunt for a label you can already see on the front.
| What you can see | What it usually is | What to do next |
|---|---|---|
| White or grey plastic leaving the boiler wall and running to a gully or a drain, sometimes dripping while the heating is on | Condensate from a condensing boiler | This page. Look from the ground. Warm water only if it has frozen and you can reach it safely |
| A brass tap or bib, with or without a hose | The outdoor tap | The outdoor-tap page. Isolate indoors and drain it. Do not confuse it with the plastic run |
| A copper pipe that starts gushing, often when the heating is on, with the gauge high or the boiler locked out on pressure | A pressure-relief discharge, not condensate | Stop. Read the pressure page if the gauge is the clue. Do not thaw a copper relief pipe as if it were plastic condensate |
| A plastic pipe you can only see above head height, across a flat roof, or behind a locked gate | Still possibly condensate, but not a ground-level job | Do not climb. Phone from the plumbing list |
| An oil tank, a gauge on a tank, or the smell of heating oil | The stored fuel, not the condensate run | The oil-tank page. A condensing oil boiler can still have a plastic condensate pipe beside it |
An oil-fired condensing boiler can have the same sort of plastic discharge. The tank, the order and the gauge are the oil-tank page. Gas work done as a business sits on the Gas Safe register. The Gas Safe note says when that register applies. An oil appliance is not that register. When you phone, say gas or oil before you say “boiler”, and ask which qualification covers the appliance in your nation. This site does not sell a badge and does not check the card for you.
What to look at before the frost
You are identifying a pipe you can already see, not altering it. Stay off a ladder. Saturday is still showery and windy in the north and west, and Sunday evening brings a gales watch for Irish Sea coasts. A wet ladder against a gable is not the check.
- Find the boiler inside. Note the make on the case. Do not remove the cover. If the display already shows a code, write it down and photograph it.
- From the ground outside, find the plastic pipe that leaves that wall and falls toward a drain. If you cannot see one, the condensate may run inside to a waste under the sink. An internal run is not tonight’s frost job.
- Look for a bare length, a low bend, or a sag where water can sit. Worcester Bosch says ice forms at those points even when some of the pipe is lagged, in a long freeze. A single night is a smaller test. The bare sag is still the place to know.
- If you already have split foam and the pipe is at hand height, you can sleeve the bare plastic. Leave the open end free so water can still leave. Do not tape a bag over the outlet. Do not wrap the flue, the air intake, or a copper relief pipe and call that lagging.
- Leave the garden tap to its own page. Shutting the indoor valve on the bib does not empty a condensate pipe, and pouring water on the bib does not thaw the boiler.
Worcester Bosch’s manuals tell you to thaw only a condensate pipe that is at ground level and easy to reach, and never one that is at height. A fall off a ladder is not a heating repair. If the plastic is on a roof, over a stairwell, or behind a spinning meter cupboard you do not understand, stop and phone.
One line on Worcester Bosch’s prevention list fights a different page on this site. They suggest turning the boiler’s heating control to maximum, because a hotter flow condenses less and can keep an exposed pipe clearer. The flow-temperature page is the opposite setting for an ordinary autumn on a condensing combi: a lower radiator dial, with a stored cylinder kept at 60°C. For a single frost night, a higher flow is a short tactic on a pipe you already know is exposed. It is not a setting to leave up all winter, and it is not a dial to twist if you cannot tell the flow control from the hot-water control. If the pipe is lagged and indoors for most of its run, leave the dial where the flow page put it.
A landlord’s boiler is still their appliance. Looking from the path and writing down a code is fine. Cutting the pipe, moving it inside, or opening the case is not your repair. Tell them the make, the code, and whether the outside plastic looks bare. In England, Scotland and Wales the gas emergency line below is for a smell of gas, not for a cold house with a frozen pipe and no smell.
If the boiler has already stopped
Use this section only when three things are true together. The outside temperature has been around freezing or below. The plastic pipe is one you can reach from the ground. The boiler has stopped, gurgled, or shown the code the handbook links to condensate. If any of those is missing, go back to the will-not-fire page and check the programmer before you fetch a jug.
Worcester Bosch’s thaw, on the page above and in their appliance manuals, is specific. Find the blockage as closely as you can: open end, elbow, or sag. Thaw the outside of the pipe with a hot-water bottle, a microwaveable heat pack, or a cloth soaked in hot water. Warm water, not boiling, can go on from a watering can. Their manuals warn that water you pour can freeze on the path and become a slip hazard, and that boiling water can crack the plastic. Reset once the pipe is clear, then wait two or three minutes for the appliance to restart. Hold times differ by model. Follow the handbook’s reset rather than a guess. If it does not restart, stop. A second and third reset is the will-not-fire rule: once is a test, a loop of resets is not a repair.
- Smell before you pour. Gas, or a carbon monoxide alarm, ends this list. Leave, avoid switches, and use the emergency number in the next section.
- Confirm the pipe is plastic condensate at ground level, using the table above. Put the jug down if it is copper and gushing.
- Pour warm water along the exposed length, or hold a hot-water bottle against the cold spot. Repeat until the pipe gives, or until water that was trapped starts to drain. Keep the runoff off steps.
- Reset once, the way the handbook shows, and wait two or three minutes. If the burner stays lit, watch it. If the same code returns, stop.
- If the plastic has split, or water is running from a joint rather than the drain, do not tape it up as a fix. That is a phone call.
A drip from the end of the pipe while the heating runs is condensate leaving, which Worcester Bosch treats as normal. A pipe that stays silent when the heating is calling, feels solid with ice at a sag, or comes with a gurgle from the case is the frozen one. Do not seal the outlet to “stop the drip”.
Sunday’s milder air is not a substitute for that reset. If the ice has already locked the boiler, the front will stay dark or faulted until the pipe is clear and someone presses reset. Rain arriving from the southwest on Sunday evening does not run backwards up the plastic. Do the thaw in daylight if you can, when you can see the sag and the path. If the house is already cold and someone in it is in the groups the NHS names on Keep warm, keep well — people aged 65 and over, babies and children under 5, people with a long-term health condition, pregnant women, or anyone who cannot heat the rooms they use — do not spend the night on a jug. Phone, and heat one room you can use safely while you wait. A plug-in heater has its own limits on the heater page.
Who to call, and what to say
Stop the homeowner sequence if any of these are true. Another jug of water will not finish them.
- You smell gas, hear a hiss you cannot place, or the carbon monoxide alarm sounds. Leave the house and avoid switches. In England, Scotland and Wales call the Gas Emergency Service on 0800 111 999. In Northern Ireland, nidirect and the Utility Regulator give the gas emergency line as 0800 002 001. Do not look for a directory number first.
- The pipe is above you, on a roof, or only reachable from a ladder. Worcester Bosch’s falling-hazard line is the stop. Open plumbing and heating and say the pipe is out of reach.
- You have thawed a ground-level pipe, reset once, and the boiler locks out again. Read them the code and the make. Ask for a Gas Safe licence number on a gas boiler. On oil, ask what register covers oil work where you live.
- The plastic is split, or a copper relief pipe is discharging and will not stop. That is a repair, not a thaw.
- You rent. Report the code, the time it failed, and a photo of the outside pipe. Looking is fine. Opening the case is not.
On the call, say whether the appliance is gas or oil, the make, the code on the display, and that you either thawed a ground-level plastic pipe or could not reach it. Say if the heating worked before Saturday night and failed after the clear spell. Ask whether the figure they give is for a thaw and reset, a new external run, or a full diagnosis, and whether it includes VAT. A listing that shows Gas Safe is showing a field already on the card. It is not a badge this site sells, and it is not a check that the person is on the register today. You still ask for the licence number.
City lists are the same directory with a place attached. For the northern spots in tonight’s note, that might be plumbing in Leeds, plumbing in Aberdeen, or plumbing in Belfast. You use the number on the card. The contact-details page only shows how that call works. Nobody here forwards the job, and a guide is not a quote. Pounds for a new boiler live on the boiler replacement note. A scheme such as the Boiler Upgrade Scheme lives on the grant notes. A frozen pipe does not, by itself, make you eligible for either.
Questions that decide the next step
Will Saturday night freeze every condensate pipe in the UK?
No. The Met Office note of 9 October 2026 puts the frost risk in more prone spots in northern parts of the UK, after skies clear on Saturday evening. Southern spots can still reach about 15°C between showers. An unlagged pipe on a cold north wall is the one to look at. A mild sheltered wall is not an emergency.
Can I pour boiling water on a frozen condensate pipe?
No. Worcester Bosch says to use warm water, not boiling water, and only on a pipe you can reach from the ground. Boiling water can crack the plastic. Do not use a naked flame, and do not climb to a pipe at height.
Is the white plastic pipe the same as the outdoor tap?
No. The outdoor tap is the brass fitting you isolate and drain. The condensate pipe is the plastic run that carries water from a condensing boiler to a drain. A copper pipe that is gushing is more likely a pressure-relief discharge. Treat each one as its own job.
Need a number for the boiler?
Open the list, pick the city, and contact the business yourself. If you smell gas, use the emergency line for your nation first.