Does Living Near The Sea Affect My Boiler?
Yes, it can. Salty air speeds up rust and corrosion on anything metal outside your home, and that includes your boiler's flue (the pipe that carries fumes outside), the guard around it and the clips and pipework on the outside wall. Strong coastal winds can also blow against the flue and, now and then, make a boiler switch itself off. None of this means a boiler won't last by the coast. It just needs a little more watching.
This post explains what the sea air does, the signs to look for, the checks you can safely make from the ground, and what a service and a good installation do to help. You can look, but never touch or try to repair the flue, and never take the boiler's casing off. Those are jobs for a Gas Safe registered engineer.
Why salty air matters
Sea spray and wind carry tiny particles of salt inland, and they settle on walls, windows and fittings. Salt holds on to moisture, so metal surfaces stay damp for longer, and that speeds up rust. It's why garden furniture, car bodies and window fittings near the coast wear faster than they do further inland.
How far this reaches depends on how exposed your home is. A house facing the water on a headland gets far more salt than one in a sheltered street a mile back. Much of Pembrokeshire is close to the sea on three sides, so many homes here get at least some.
The parts of a boiler most affected
Inside your home, a boiler is mostly protected. The parts that take the weather are outside:
The flue terminal, the end of the flue sticking out of the wall or roof. Its metal parts and seals can corrode, and a damaged terminal could let fumes escape where they shouldn't.
The terminal guard, the wire or plastic cage fitted where a flue is low enough to be touched. Metal guards can rust and break up.
Brackets, clips and pipework on the outside wall, including the condensate pipe (the plastic pipe that carries waste water from a condensing boiler to a drain).
Boilers in a garage, lean-to or utility room with an outside door can also see rust spots on the casing, because salty air gets in more easily.
If you have an oil boiler fitted outside, it takes the full force of the weather. Its casing, oil supply line and fittings are worth an extra look, and our oil boiler services cover them.
Wind and boilers that cut out
Condensing boilers push their fumes out through the flue with a fan. In very strong winds, gusts blowing straight at the flue can upset that airflow, and some boilers respond by shutting down or showing a fault code to stay safe.
If your boiler only cuts out in a gale and works again once the wind drops, mention it to your engineer. It doesn't always mean a fault, but the flue's position, its terminal or a sensor may need looking at. Never cover or block the flue to stop the wind, as that can make fumes come back into the house. If it happens often, our boiler repair service can find out why.
Safe checks you can make
Every few months, and after a big storm, take a look from the ground:
Look at the flue terminal for rust, staining on the wall around it, cracks or anything that looks loose or bent.
Check the guard, if there is one, is still in place and not broken.
Make sure nothing is blocking the flue, such as plants, bins, a new shed or a bird's nest.
Check the outside pipework, including the condensate pipe, is still clipped to the wall and not cracked.
Look at the boiler casing for rust spots if it's in a garage or outbuilding.
Don't climb up to a flue, and don't touch or tape over a damaged one. If anything looks wrong, turn the boiler off and book an engineer.
A working carbon monoxide alarm near the boiler matters even more when a flue is weathered. Call an engineer straight away if you notice black marks or soot around the boiler, or a lazy yellow or orange flame on a gas appliance instead of a crisp blue one.
If you smell gas, open doors and windows, don't use light switches or anything that could cause a spark, turn the gas off at the meter if you can safely reach it, leave the property and call the National Gas Emergency Service on 0800 111 999.
How a service helps
A yearly service is when the outside parts get a proper check. On a service, the engineer looks at the flue and its terminal along their length where they can be seen, makes sure the joints and seals are sound, and tests how the boiler is burning with a flue gas analyser. They'll also check the casing seal, as a boiler's casing helps keep fumes contained.
If you live in an exposed spot, ask your engineer to pay particular attention to the outside parts and to note any early rust on the report, so it can be dealt with before it becomes a repair. Our post on what a boiler service should include goes through the rest of the visit.
Planning a new boiler by the coast
If you're replacing your boiler, the survey is a good time to think about the weather. An installer can look at where the flue will come out, whether a more sheltered wall is possible, whether a plume kit (an extra pipe that moves the flue's outlet to a better spot) would help, and which guard and fittings suit the position. Following the manufacturer's installation instructions for the site also matters, as it can affect the warranty.
Our boiler installation page explains how we survey a home before recommending a boiler.
Looking after your boiler by the sea
Sigma Plumbing & Heating is based in Hakin, Milford Haven, and is Gas Safe registered, an ATAG Selected Partner and an Intergas accredited installer. If your home is close to the sea and your boiler hasn't been checked this year, book a visit through our boiler servicing page and we'll look over the outside parts as well as the boiler itself
