Winter boiler breakdown calls: how to answer the cold-snap surge

Boiler breakdown work bunches into the winter months. Boiler Guide's ten years of repair enquiries from UK households, 2009 to 2019, put 15.56% of boiler repairs and breakdowns in January and 12.01% in December, against 3.8% of enquiries in July. Those calls come in when you are busiest on the tools, so settle who answers them before the first frost.

When do boiler breakdowns peak?

January, then December, in the monthly data I could find. Boiler Guide, a UK site where homeowners compare quotes from heating engineers, analysed ten years of repair enquiries by month. By its count, 15.56% of boiler repairs and breakdowns happen in January and 12.01% in December. July is the quietest month, with 3.8% of enquiries, which makes a January roughly four times as busy as a July. The site also says demand for new boilers or boiler repairs is "always lower between March and October".

Which? points the same way from a different angle. In research published in October 2025, it surveyed UK homeowners who had replaced or upgraded their heating in the two years before the survey, and found emergency replacements "most likely to happen in winter (33%) compared to spring (24%) or summer (20%)".

Both figures measure something narrower than every breakdown in a country: enquiries on one website, and replacements in one survey, both in the UK.

How big is a cold-snap spike?

Big enough to show up at the merchant's counter. City Plumbing recorded a 21% increase in boiler spares sales in the first two weeks of January 2026 against the same weeks of 2025, and a 25% increase in items picked from branch stock. City Plumbing's release ties the rise to a sharp cold snap in early January, with snow and sub-zero spells as Storm Goretti hit on 8 January. "Our figures show just how quickly breakdown demand rises when temperatures fall," said Roz Kane, City Plumbing's managing director for spares.

Spares sold are a step removed from calls answered. Read the 21% as the direction of travel, and count your own spike from your own call log.

The Netherlands started 2026 the same way. Installatie.nl reported "een duidelijke piek in storingsmeldingen" (a clear peak in breakdown reports) in the first winter week, mainly from older boilers and systems without recent maintenance. On 5 January the Reformatorisch Dagblad quoted trade body Techniek Nederland: many extra breakdown reports were coming in, engineers were busier than normal, and they could still cope.

You may also run into "up to 278%". That comes from one UK repair company, theboilercompany.com, describing its own emergency callouts in cold and snowy weather over two years, in an article Plumbing Trade Magazine ran in May 2019. The same article says callouts "drop by up to 156%" in warm weather, and a count cannot fall by more than 100%, so I would leave both figures out of your planning.

Why does a surge cost you jobs?

Because the calls arrive while you are working. An engineer with their hands inside a boiler is not holding a phone. During a Dutch frost in December 2022, the director of Hove Techniek in Zwaag told InstallatieTotaal: "Vanochtend stroomde mijn voicemail letterlijk vol." His voicemail had filled up that morning.

A full inbox still undercounts the queue. Invoca's platform data shows that less than 3% of callers who get pushed to voicemail leave a message - I went through why callers won't leave one in an earlier post. If that figure held for Hove Techniek, whoever left a message that morning was a small share of whoever rang.

A voicemail box that fills up in a frost holds only the callers who left a message. On Invoca's data, that is fewer than 3 in 100 of the callers pushed to it.

The wait hurts the customer as well as you. Which? found that twice as many homeowners whose replacement was an emergency reported an emotional toll as homeowners whose replacement was not (61% vs 32%), and says uncertainty about waiting times can cause intense stress and anxiety. A beep tells a caller nothing about when anyone will come.

Which breakdown calls should come first?

My order runs from safety down to the work that can wait for the thaw, and the top of it is a call nobody should try to book:

• A gas smell or a carbon monoxide alarm comes before any appointment: the caller needs to leave the building and call the gas emergency line or the emergency services.
• Customers on a maintenance contract. When InstallatieTotaal covered the December 2022 frost, it put it plainly: members of Techniek Nederland leave nobody in the cold, "maar mensen met een onderhoudscontract hebben voorrang" - but people with a maintenance contract get priority. A cold week is when a service plan's promise gets tested.
• No heat at all, or someone vulnerable at home, ahead of a dripping valve.
• Annual services and quotes once the frost has passed, provided someone took their details.

That order needs something to answer the phone first and find out which kind of call it is.

What should answer the calls you can't take?

Option	In a cold-snap week	Where it falls down
Voicemail	Catches whoever leaves a message	Under 3% of callers pushed to it do, on Invoca's data
You, between jobs	You hear the problem first-hand	Each call is time off the boiler in front of you
A second person on the phone	A human voice who knows the business	Handles one caller at a time
AI receptionist	Callers answered and the job booked	A set number of callers at once, and a monthly minute allowance

SwiftGuard's AI receptionist answers within two rings once a call reaches it, day or night (on a divert for only the calls you miss, your own phone rings out first), and puts each caller's name, address and problem in your dashboard. Once your Google Calendar is connected, it books the job straight into it. When a call sounds urgent, such as a leak, no heating or no hot water, or someone at home is vulnerable, it notes the urgency in the booking for you, and it is told never to promise how soon someone will come. A caller who reports a gas smell or a carbon monoxide alarm is told it cannot handle an emergency, and to leave the building and call their national gas emergency line or the emergency services.

Know the limits before the frost, because a surge is where you meet them. Each plan answers a set number of callers at the same time (3 on Starter, 6 on Pro and 12 on Scale), and the next caller past that gets a busy tone. The included minutes are a monthly cap as well: Starter is €69 a month ex VAT for 150 minutes, and once a month's minutes are used up, callers get a busy tone until the allowance resets or you move to a bigger plan.

Get ready before the first frost

Three jobs for the autumn. Set a divert for only the calls you miss, so your phone still rings first. Go back through last January's call log and count the calls you missed, paying attention to the busiest hour as well as the busiest week. Then choose capacity for that hour: if four callers ever tried to reach you at the same moment, a plan that answers three at once turns the fourth away.

When you know your number, compare the plans against it.