Compare quotes for a boiler hot water repair in Radyr
A combi that fires for heating but not for a tap often has a diverter valve or flow sensor fault. Write down any fault code before you call.
One enquiry about the job in Radyr can reach up to four independent heating engineers, depending on the job and which engineers are free. The matching is free. You can turn down every quote.
Work to include in your enquiry
This repair fixes a gas boiler that still heats the house but gives no hot water, or only warm water. On a combi, the cause is often inside the boiler. On a system with a cylinder, it may be a valve, thermostat or the programmer instead.
Things to mention when you enquire
- The heating works but the hot water does not
- The boiler not firing when a hot tap opens
- Hot water that depends on the heating being switched on
- Water swinging between hot and lukewarm
- A cylinder that stays cold on its timer
On the day
Fault finding comes before any part is ordered. The visit usually covers:
- Checking pressure, power, the condensate pipe and the programmer.
- Checking the diverter valve, flow sensor and temperature sensors inside the boiler.
- On a cylinder system, testing the zone valve and cylinder thermostat.
- Fitting the replacement part, refilling and bleeding the system if it was drained.
- Running heating and hot water separately and confirming the gas side is safe.
Combi and cylinder systems fail in different places
On a combi, hot water faults usually sit inside the boiler casing: the diverter valve, flow sensor or plate heat exchanger. With a cylinder, the boiler may be fine and the fault in a motorised valve or cylinder thermostat elsewhere. Telling the engineer which you have helps them bring the right parts.
Preparing for the visit
Clear access to the boiler and any cylinder controls. The engineer should explain the diagnosis before replacing parts, then check heating and hot water independently and leave the casing correctly secured.
Paying for boiler hot water repair in Radyr
The UK guide range we use is £120–£450. It is a national guide, not a local tariff. A diagnosis with a simple fix, such as a flow sensor clean or a pressure problem, is at the lower end. A diverter valve cartridge sits in the middle. A full valve body, plate heat exchanger or control board sits at the top, and some boards cost more than this range.
Get the call-out fee, parts and labour broken out on the quote, with VAT stated. Allow 1–3 hours for the work itself; awkward access or waiting for a part can take longer.
What to tell the engineer
Give the boiler make and model, the age if you know it and any fault code on the display. Say what happens when a hot tap opens: does the boiler fire, and does any warm water come through? Mention a recent service, cold snap or pressure drop.
Once quotes arrive, compare the detail. Ask whether the price covers diagnosis only or the likely part too, and how a second visit is charged if a part has to be ordered. Check the guarantee on both the part and the labour.
Qualifications and approvals
Opening a gas boiler and changing its internal parts must be done by an engineer on the Gas Safe Register. A like-for-like part replacement is not notifiable under Building Regulations. Never remove the boiler casing yourself, and stop using the boiler if you smell gas.
If you are not sure whether building control needs to know, ask Cardiff Council. If the job expands beyond a straightforward repair, confirm which approvals apply before the extra work starts.
Getting an engineer to Radyr
Engineers covering Radyr, Cardiff need the full postcode. Mention parking limits or permit zones. Photographs showing the boiler cupboard and hot water cylinder, if fitted help with planning. Neighbouring houses often have different systems, so describe the one in yours.
Surrounding towns and villages
Each postcode in Cardiff is matched on its own. The businesses able to reply depend on the job and their coverage.
Marshfield, Whitchurch, Canton, Llandaff, Llantrisant, Roath, CowbridgeSend the details when you are ready
The free enquiry form takes a couple of minutes. We ask engineers who join for their insurance details and references, but look at their current documents yourself before you book. We pass on your enquiry. The business you choose gives the advice, sets the price and carries out the work.
For a suspected gas leak in Great Britain, call 0800 111 999 straight away. This service does not arrange emergency call-outs. In Northern Ireland, the gas emergency number is 0800 002 001; for LPG, contact your supplier.
Answers to common hot water questions
How can I compare quotes for boiler hot water repair in Radyr?
Fill in one enquiry form with your postcode and details of the boiler display and whether a hot tap makes it fire. It can go to as many as four independent heating engineers who work in Radyr. How many reply varies with the job and how busy engineers are, and booking any of them is up to you.
Roughly how much is boiler hot water repair in Radyr?
We use £120–£450 as a UK guide. Engineers in Radyr price their own work, and the system, access and parts affect the total. A written quote should list labour, parts, VAT and any call-out fee.
Is the diverter valve the usual cause of no hot water on a combi?
It is one of the most common causes, along with the flow sensor and a scaled plate heat exchanger. A diverter that sticks in the heating position directs primary heating water towards the radiators instead of heating the tap water through the heat exchanger. An engineer needs to test the parts to be sure.
Can a hot water fault be fixed in one visit?
Often, if the engineer carries the part for your boiler. Diverter valve bodies, plate heat exchangers and control boards may need ordering. Ask how the return visit is charged before agreeing to the work.
Should I repair or replace an old boiler with no hot water?
Ask the engineer for the repair price and their view of the boiler’s condition in writing. A small part on a sound boiler is usually worth fixing. A major part on a boiler near the end of its life may not be.
How long should I allow for boiler hot water repair?
Allow 1–3 hours as a guide. Once the engineer has seen the system, they should tell you how long the heating or hot water will be off. Waiting for a part or awkward access can add time.