Frequently Asked Questions
Common questions about boiler servicing, repairs, payment, working hours and more - answered by Swansea Gas & Oil, your local family-run heating engineers.
Need help right now?
Our engineers cover Swansea, Llanelli, Neath, Port Talbot & every SA postcode in between.
- Same-day response in most cases
- No call-out fee for care plan members
- 0% finance on new installations
Registered & Trusted
We accept card payment, bank transfer, and cash. Care plan members pay by monthly direct debit through GoCardless, with no long-term contract lock-in.
Our office hours are Monday to Sunday, 8:00am to 6:00pm. For care plan members and existing customers, we also offer 24-hour emergency callouts outside of these hours for genuine breakdowns and safety issues.
We are based in Gorseinon and cover Swansea and the wider South Wales area, including all SA postcodes, Llanelli, Neath, Port Talbot, and surrounding towns and villages. If you are unsure whether we cover your area, just give us a call.
Yes. We are fully Gas Safe registered for gas appliances and OFTEC registered for oil heating systems. You can ask to see our registration cards on any visit.
In most cases we can attend within 24 hours, and often the same day. Care plan members receive priority booking for breakdowns and repairs.
Yes. Our care plans start from just £10 per month and include your annual boiler service, breakdown cover and repairs. Most plans also include no excess and no call-out charges, with the exception of our Bronze Oil Boiler Care Plan, where a call-out fee applies. We offer plans for both gas and oil systems.
Call-out fees are included in most of our care plans. The exception is our Bronze Oil Boiler Care Plan, where a call-out fee applies.
While it is technically possible, we would always recommend having your boiler serviced by a Gas Safe registered engineer. A professional is far better placed to spot early warning signs of a fault, and many boiler warranties are only valid if the boiler has been serviced annually by a registered engineer. Faulty boilers can also pose serious safety risks, including carbon monoxide leaks.
We recommend an annual service for every boiler, gas or oil. This keeps your boiler running safely and efficiently, helps avoid unexpected breakdowns, and keeps most manufacturer warranties valid. The best time to book is late summer or early autumn, before the colder months set in.
Not at the moment, however we are exploring options to be able to offer this. Please do speak to us if you need a replacement boiler but would struggle with the cost, and we can explore options with you.
This is one of the most common boiler faults we are called out for. It is usually caused by a small leak somewhere in the system, a faulty pressure relief valve, or a failing expansion vessel. While topping up the pressure yourself can be a temporary fix, if it keeps happening it is a sign of an underlying issue that needs investigating by an engineer.
This is a classic sign of trapped air in the radiator, and usually means it needs bleeding. If bleeding does not solve it, or it keeps happening, it could point to a build-up of sludge in the system, which may require a power flush.
This is the opposite problem and is usually caused by a build-up of sludge or debris settling at the bottom of the radiator, restricting the flow of hot water. A power flush is typically the best long-term fix for this issue.
There are several possible causes, ranging from a simple loss of pressure or a tripped electrical switch, to a more serious fault with the ignition, pump, or PCB. We would always recommend not attempting a repair yourself and calling a Gas Safe registered engineer.
This usually points to an issue with the diverter valve, which controls whether your boiler sends hot water to your taps or to your radiators. It can also be caused by a faulty thermostat or motorised valve.
Often referred to as 'kettling', this is usually caused by limescale or sludge build-up restricting water flow around the heat exchanger. Left untreated, it can cause long-term damage to the boiler, so it is worth getting checked sooner rather than later.
This can be caused by a number of issues including low water pressure, a faulty thermostat, problems with the pump, or a blocked condensate pipe, especially in winter when it can freeze. An engineer will need to diagnose the exact cause.
Most modern boilers display a fault code on the display panel when something is wrong. The code will vary depending on the manufacturer and model, but it always means the boiler has detected an issue and should not be ignored. Contact us with the code and we can usually advise what it means before we even arrive.
Still have a question?
Give our friendly team a call and we'll be happy to help — no charge for advice, no obligation quotes.
