Your boiler has stopped working. There is no heating, no hot water, and depending on the time of year, the temperature in your home is already dropping. This is one of the most stressful situations a homeowner can face — and unfortunately, it tends to happen at the worst possible times.
If you are dealing with a boiler not working situation right now, the first thing to know is that you have options — and you do not need to make a rushed, expensive decision without understanding what those options are. In this guide, the team at Gorilla Heat walks you through exactly what to do when your boiler fails, how to decide between repair and replacement, and how to get a new boiler installed as quickly as possible.
First: What to Do When Your Boiler Breaks Down
Before calling anyone, run through these quick checks. Many boiler failures have simple causes that do not require a replacement at all:
1. Check the pressure gauge. Most combi and system boilers need to operate between 1 and 1.5 bar. If the needle is below 1, the pressure has dropped and the boiler may have locked out. Repressurising the system via the filling loop can resolve this immediately.
2. Look for an error code. Modern boilers display fault codes when something goes wrong. Note the code and check your boiler manual — many common faults (ignition failure, frozen condensate pipe, low pressure) have straightforward fixes.
3. Check the thermostat and timer. It sounds basic, but a surprising number of boiler “breakdowns” turn out to be a thermostat set too low or a timer that has lost its programme after a power cut.
4. Check your gas supply. Try turning on a gas hob if you have one. If that is also not working, the issue may be a supply interruption rather than a boiler fault — contact your gas network operator.
5. Reset the boiler. If none of the above applies, try pressing the reset button and allowing the boiler to restart. Some faults clear themselves after a single reset.
If none of these steps restore the boiler to working order, it is time to call a Gas Safe registered engineer for a proper diagnosis.
Emergency Boiler Repair vs Emergency Boiler Replacement — Which Is Right?
This is the question most homeowners are wrestling with when their boiler goes down — and it is an important one to get right. Paying for a repair on a boiler that is already past its useful life just delays an inevitable and probably more expensive breakdown down the line.
Here is a straightforward framework for thinking about it:
| Consider repair if… | Consider replacement if… |
| Your boiler is under 8 years old | Your boiler is over 10 years old |
| The fault is a single, clearly identified component | It has broken down more than twice in the past year |
| The repair cost is under half the price of a new boiler | The repair costs more than half the price of a new boiler |
| The boiler has been regularly serviced and is otherwise in good condition | Parts are hard to source or no longer available |
| Your energy bills have not risen significantly | Energy bills have been climbing despite no change in usage |
If your boiler ticks two or more boxes in the replacement column, an emergency boiler replacement is almost certainly the smarter financial decision — even in the short term. Continuing to pour money into a failing system is rarely worth it when a new boiler can be installed within 24 to 48 hours in most cases.
How Quickly Can an Emergency Boiler Be Replaced?
Faster than most people expect. In most cases, a straightforward like-for-like combi boiler replacement can be completed within one working day. The timeline from initial contact to a working boiler typically looks something like this:
| Timeframe | What Happens |
| Same day | Contact Gorilla Heat — we assess the situation, confirm the fault, and discuss replacement options with you |
| 24–48 hours | New boiler sourced and installation date confirmed — often next day for standard combi replacements |
| Installation day | Old boiler removed, new boiler fitted, system tested and commissioned — heating and hot water restored |
| Same day | Gas Safe certification completed and warranty registered with the manufacturer |
Complex installations — such as switching boiler type, relocating the unit, or replacing a system boiler with a new cylinder — may take longer. But for the most common scenario of a straight combi swap, next-day installation is realistic in most cases when you are working with an established local installer.
Boiler Not Working: No Hot Water — What Can You Do in the Meantime?
While you wait for a replacement to be arranged, there are some practical steps that can help you manage without hot water and heating:
• An electric shower can provide hot water independently of the boiler — if you have one fitted, it will continue to work normally
• An immersion heater, if your property has one in the hot water cylinder, can heat a tank of water electrically without needing the boiler
• Electric plug-in radiators or oil-filled heaters can keep specific rooms warm until the new boiler is installed
• If you are a tenant, your landlord has a legal obligation to restore heating and hot water within a reasonable timeframe — typically 24 hours in cold weather
If you have young children, elderly residents, or anyone with a health condition in the property, prioritise getting an engineer out as quickly as possible. In particularly cold weather, a loss of heating can become a welfare concern.
How Much Does an Emergency Boiler Replacement Cost?
The boiler replacement cost UK for an emergency installation is typically the same as a planned replacement — reputable installers do not charge a premium simply because the situation is urgent. Be cautious of any company that significantly inflates the price for emergency work, as this is a common tactic used by less scrupulous traders.
As a general guide for 2026:
| Installation Type | Typical Cost (2026) |
| Combi boiler — like-for-like replacement | £2,000 to £3,200 |
| System boiler + new cylinder | £2,800 to £4,500 |
| Regular boiler — like-for-like | £2,200 to £3,800 |
| Combi conversion from regular | £2,500 to £4,200 |
At Gorilla Heat, we offer 0% finance on all new boiler installations — including emergency replacements. That means even if the timing is unexpected, you do not have to find the full cost upfront. You can spread the payments into manageable monthly amounts at no extra charge.
Why a Gas Safe Registered Engineer Is Non-Negotiable
When your boiler fails and you need help fast, it can be tempting to go with whoever is available quickest — but cutting corners on Gas Safe registration is something you should never do, regardless of how urgent the situation feels.
In the UK, only a Gas Safe registered engineer is legally permitted to install, repair, or replace gas appliances. An unregistered installation is not just illegal — it is dangerous. It voids your home insurance, invalidates your new boiler warranty, and leaves you with no legal recourse if something goes wrong.
Always ask to see the engineer’s Gas Safe ID card before any work begins, or check their registration on the official Gas Safe Register website. Every Gorilla Heat engineer is fully Gas Safe registered, and we are happy to show our credentials before starting any job.
Need an Emergency Boiler Replacement? Call Gorilla Heat
If your boiler has broken down and you need a fast, reliable replacement, Gorilla Heat is here to help. We are a veteran-owned, family-run business with over 20 years of experience — Gas Safe certified and Worcester Bosch approved installers who respond quickly and get the job done right.
We cover Barton-upon-Humber, Immingham, Grimsby, and the wider North Lincolnshire and East Yorkshire area. With 0% finance available, the cost does not have to be another thing to worry about.
Contact our team now and we will get back to you as quickly as possible with your options. The sooner you call, the sooner your heating and hot water is back on.
Frequently Asked Questions
What should I do if my boiler stops working suddenly?
First, run through the basic checks — boiler pressure, error codes, thermostat settings, and gas supply. Many boiler failures have a simple cause. If none of these resolve the issue, contact a Gas Safe registered engineer for a proper diagnosis. Do not attempt to carry out gas work yourself.
How quickly can an emergency boiler replacement be done?
In most cases, a straight combi boiler replacement can be completed within 24 to 48 hours of your initial contact with an installer. The installation itself typically takes one working day. More complex jobs — such as switching boiler type or relocating the unit — may take longer.
Should I repair or replace my boiler in an emergency?
If your boiler is under 8 years old and has a clearly identified, single fault, repair is usually worth considering. If it is over 10 years old, has broken down repeatedly, or the repair cost exceeds half the price of a new boiler, replacement is almost always the more sensible financial decision — even in an emergency situation.
How much does an emergency boiler replacement cost in the UK?
Emergency boiler replacement costs are typically the same as a planned replacement — between £2,000 and £3,200 for a standard combi boiler installation. Avoid companies that significantly inflate prices because of the urgent nature of the work. Gorilla Heat does not charge a premium for emergency replacements and offers 0% finance to spread the cost.
What can I do for hot water while waiting for a boiler replacement?
If you have an electric shower, it will work independently of the boiler. An immersion heater, if fitted, can heat water in your cylinder electrically. Electric plug-in heaters can keep key rooms warm in the short term. If there are vulnerable people in the household, prioritise getting an engineer out as quickly as possible.