Mayfair · Heating & hot water
My boiler pressure keeps dropping
Get the fault understood, the next step explained and the repair underway.
Across London · Homes, landlords & managed properties · Your area: Balham
For safely accessible, straightforward faults. Parts, materials and further work quoted separately. If a fix needs more work, the agreed visit charge covers call-out and assessment.
Call for your visit price and arrival estimate. Sending a form does not book a visit.
Repeatedly falling boiler pressure needs the underlying cause checked. Tell Mayfair how quickly the reading drops, whether the system stops working and whether you have noticed water around a radiator, pipe or the boiler.
Your visit, explained
Call-out, assessment and labour to fix a small, straightforward issue on the first visit.
For safely accessible faults that can be resolved on the first visit. Parts, materials and further work are quoted separately for your approval.
For urgent London plumbing and heating repairs, we aim to arrive within 1 hour, subject to availability, postcode, the specialist required and travel conditions. Call for your estimated arrival time.
Check availability: 020 4571 4235If a first-visit fix isn’t possible, the agreed visit charge still covers the call-out and assessment. We explain the fault and quote any parts, further investigation or larger repair for your approval.
We’ll give you the full visit price when you book. There is no additional call-out fee on top of that price.
Any workmanship guarantee is set out in your written quotation: the work covered, duration, exclusions and how to report a problem. Product warranties follow the manufacturer’s terms. A repair does not automatically guarantee the whole existing system. Your statutory consumer rights are unaffected.
Gas work must be carried out by an appropriately qualified Gas Safe registered engineer. Electrical and unvented hot-water work need the relevant competence and certification where required. Mayfair matches the work to the appropriate specialist.
Read the service booking information · How to check Gas Safe registration
The situation matters more than the name of the fault. Use the safety guidance above if anyone may be at risk.
Start with what you can see
Repeated pressure loss needs investigation; topping up does not explain why it keeps happening. Share the cold pressure reading, how quickly it drops and any visible leaks or fault code. Use only your appliance’s own user instructions for routine checks; do not remove the casing.
Understand the repair
On a sealed heating system, lost water or a fault affecting pressure control may need investigation. A hidden leak, an accessible connection and a boiler component involve different checks. The pressure reading alone cannot establish the cause.
A useful first enquiry
Normal pressure and filling instructions depend on the appliance. Use the manufacturer’s user guidance rather than a universal pressure target. Repeated topping up does not resolve a recurring fault; arrange assessment and do not open the boiler casing.
A visible radiator leak and a concealed heating-pipe leak have different investigation costs. Confirm whether leak tracing, opening floors or ceilings, boiler parts and reinstatement are included or need separate quotations.
Send the symptoms, equipment details and postcode. We’ll arrange the right engineer to investigate the fault and explain the repair options.
Send the details for this service →Direct to Mayfair · No chat required
Tell us what’s happening and where. We’ll help you work out the next step and what it costs.
No account needed. No payment to send an enquiry.
This is not an emergency response service. Do not wait for an online reply if there is an immediate risk to people or property.
How quotes and orders work →Example problem & repair approach
The problem: The pressure falls again after the system has been topped up.
How we can help: Check for accessible leaks and pressure-control faults. Explain the findings and quote any component repair or concealed-leak investigation needed.
Yes. Water loss may not be visible where you are looking, and pressure-control components can also need checking. Report the pattern so the engineer can decide what to investigate.
Not necessarily. A sealed heating-circuit pressure reading and the flow at domestic taps describe different parts of the system. If taps or showers have weak flow, include that separately or use the low water pressure plumbing page.
Follow your appliance’s user instructions and seek advice if pressure repeatedly drops or you are unsure. Tell the engineer how often you have added water; topping up repeatedly is not a repair.
Choose the closest problem
Start with the symptom, or choose a planned service. See what we check, repair options and what to tell us.
For leaking taps, toilets, showers and water-supply faults, use the plumbing pages. For a boiler, radiators or stored hot water, explore the heating options.
If the job involves more than one trade, include the complete list in your enquiry so the work can be planned together.