emergency
No hot water — Same-Day Plumber Across the North West
Get your hot water back with calm, practical help across the North West.
In short
No hot water can come from a simple control issue, a failed boiler part, an immersion fault, or a wider system problem. KJ Plumbers arranges vetted subcontractors across the North West to diagnose the fault, explain what has failed, and provide a written fixed-price quote before any repair work goes ahead.
Tell KJ what's wrong
Free and no obligation — we'll get a qualified local plumber on it.
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Hi, I'm KJ — honest UK plumbing advice, free, and a local plumber when you need one. Tell me what's happening — leak, blockage, boiler, emergency, anything — and I'll help you sort it.
You can send a photo, short video, voice note or share your location — whatever's easiest. Please avoid sending faces, documents, house numbers or payment cards in photos.
For genuine emergencies call 01706 318200, or the National Gas Emergency Service on 0800 111 999.
Start with one tap
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Immediate steps to keep you safe
Do not remove boiler covers
A boiler case is there for safety and should only be opened by a suitably qualified engineer. You can check external controls, thermostats and visible pressure readings, but leave internal inspection and testing to a professional.
Check for gas smells or warning signs
If you smell gas, turn off the gas at the meter if safe to do so, avoid switches and flames, open windows, leave the property, and call the National Gas Emergency Service on 0800 111 999. Do not try to restart the boiler.
Look for leaks around the boiler or cylinder
If water is dripping near electrics, controls or the boiler, switch off the affected appliance if it is safe to do so and avoid touching wet electrical parts. Place a container or towel to limit damage while you arrange a visit.
Avoid repeated reset attempts
One reset may be reasonable if your boiler manual says so, but repeatedly resetting a faulting boiler can mask the issue or put extra strain on components. Note any fault code shown on the display before contacting us.
Use temporary hot water safely
If you use a kettle for washing, take care with scalding, especially around children or vulnerable adults. Do not use unsafe heating methods or camping equipment indoors.
Common causes
What's usually behind no hot water
Boiler pressure is too low
Many combi boilers need the system pressure to sit within the normal operating range before they will fire correctly. Low pressure can stop heating and hot water, or cause the boiler to lock out with a fault code.
Controls, timers or thermostats are not calling for hot water
Programmers, smart thermostats, cylinder thermostats and motorised valves all affect whether hot water is requested. A changed schedule, flat batteries, lost pairing or faulty control can make the system appear dead even when the boiler itself is capable of working.
Diverter valve fault on a combi boiler
On a combi boiler, the diverter valve directs heat between radiators and taps. If it sticks or fails, you may get heating but no hot water, hot water that goes lukewarm, or temperature that rises and falls while the tap is running.
Ignition, flame detection or gas valve issue
If the boiler cannot light safely or prove the flame, it will lock out. This can be linked to ignition electrodes, flame sensors, gas valve operation, condensate issues or other safety-critical components that need professional testing.
Hot water cylinder or immersion heater problem
Homes with a cylinder may lose hot water because of a failed immersion element, thermostat, motorised valve, programmer or cylinder stat. The result is often a tank of cold or lukewarm water even though the central heating still works.
Airlocks, scale or flow problems
Poor flow through the hot side, blocked filters, plate heat exchanger scaling or an airlock can reduce hot water performance. This is more common where hot water starts warm then runs cold, or where flow at the tap is weaker than normal.
How KJ handles this
What happens when we're on-site
- 1
Confirm the exact hot water symptom
The engineer will ask what you are experiencing: no hot water at any tap, hot then cold water, lukewarm water, heating working but taps cold, or cylinder not reheating. This helps narrow the fault before testing begins.
- 2
Check external controls and visible readings
They will inspect accessible controls, thermostat settings, programmer status, boiler display, pressure gauge and any visible fault codes. Simple setting issues can often be identified quickly.
- 3
Test the hot water demand
For combi boilers, the engineer will run taps and check whether the boiler recognises flow and fires correctly. For cylinder systems, they will check whether the system is calling for hot water and whether valves and controls respond.
- 4
Carry out safe component checks
Where appropriate, the engineer will test relevant parts such as flow sensors, diverter valves, motorised valves, thermostats, pumps, immersion elements or ignition components. Boiler work is handled by suitably qualified engineers.
- 5
Explain the fault in plain English
Once the likely cause is found, you will be told what has failed, whether repair is practical, and if any parts are needed. The aim is to make the next step clear before you commit to repair work.
- 6
Provide a written fixed-price repair quote
After the diagnostic visit, the engineer provides a written fixed-price quote for the repair. No repair starts until you have seen the price and agreed to proceed.
Where we cover
North West England — same-day where possible
FAQ
Frequent questions
Why have I got heating but no hot water?
On a combi boiler, this often points to a diverter valve, flow sensor or plate heat exchanger issue. On a cylinder system, it may be a motorised valve, cylinder thermostat or programmer problem. An engineer can test which part is failing rather than guessing.
Why is my hot water going hot then cold?
Fluctuating hot water can be caused by poor flow, a blocked or scaled heat exchanger, a sticking diverter valve, unstable temperature sensing, or a boiler that is cutting in and out. Note whether it happens at one tap or every tap, as that helps diagnosis.
Can I fix no hot water myself?
You can check basic items such as the programmer, thermostat settings, boiler pressure, fuse spur, visible fault code and whether other gas appliances are working. Do not open the boiler casing or work on gas, combustion or internal electrical components.
How much is the diagnostic visit?
KJ Plumbers' standard diagnostic fee is £50. This covers an engineer visit to assess the fault, after which the engineer provides a written fixed-price quote for any repair needed.
Do you cover no hot water callouts across the North West?
Yes. KJ Plumbers arranges vetted subcontractors for no hot water problems across the North West, including homes with combi boilers, system boilers, regular boilers, cylinders and immersion heaters.
Will the engineer bring parts on the first visit?
Engineers carry common tools and may have some standard parts, but hot water faults can involve appliance-specific components. If a part is needed, you will receive a clear fixed-price quote before the repair is arranged.
Should I replace my boiler if there is no hot water?
Not necessarily. Many no hot water faults are repairable, especially when the boiler is otherwise in reasonable condition. Replacement is usually only discussed if the appliance is beyond economical repair, unsafe to use, or repeatedly failing.
Ready to get it sorted?
Tell KJ what's happening and get a plan in seconds.
Photos, video and voice notes welcome. Vetted local engineers · no call-out fee · written quote before any repair.