Vector Heat insights
Boiler guides
A boiler problem, a replacement quote or the annual service? Start with the question you need answered. These guides draw on our boiler surveys, installations and fault-finding work.
Something is wrong
Find the guide that matches the symptom
Start with what you can see, hear or record. These guides explain fault clues and when to arrange a visit; they cannot confirm a diagnosis for your boiler.
Boiler Not Firing Up? What to Check First
No response, no power or trying to light? Check the basics, record what happens and know when to book a repair.
No hot water at the taps
Separate a hot-water-only problem from a wider shutdown, with guides for combis and cylinders.
Boiler Leaking Water
What to check first, what the pressure gauge is telling you, and when to call a heating engineer.
Why Is My Boiler Losing Pressure?
Expansion vessels, hidden leaks and normal gauge changes: what to check before topping up again.
Boiler Pressure Too High
Why pressure rises, what the expansion vessel does, and when topping up becomes a clue instead of a fix.
Why Is My Boiler Making a Noise?
Banging, gurgling, vibration and kettling: what to check, what to record and when to turn the boiler off.
Why Does My Boiler Keep Turning On and Off?
How to tell whether the boiler is doing its job, oversized for the heat load, or short cycling because of a fault.
Worcester Boiler Flashing Blue Light
What steady and flashing blue lights mean, what to record, and how the correct reset control changes by Worcester model.
Boiler Flue: Types and Warning Signs
How modern flues work, why white plumes appear, what affects the route and which signs need a Gas Safe engineer.
Before you spend
Repairing or replacing your boiler
A fault does not settle the replacement question on its own. Look at the repair, the boiler’s condition and what a new installation would involve before choosing.
Should I Replace My Boiler or Repair It?
Liam's repair examples, model-specific advice and the checks to make before spending on a new boiler.
Boiler replacement costs
Fitted gas, LPG and oil guide prices, conversion costs and what to compare in a quote.
How long does a boiler last?
Age, condition, repair history and parts availability: the factors behind a replacement decision.
How Old Is My Boiler?
How to use data badges, serial numbers, Worcester FD codes and real label clues to estimate boiler age.
How long does a replacement take?
Straight swaps, conversions and the extra work that changes the installation timetable.
Boiler Installation FAQ
Common questions about boiler costs, surveys, hot water, flushing, filters and installation quotes.
Know your system
Boiler types, sizes and hot water
Identify what you already have, then compare the options against the way your household uses heating and hot water.
What Type of Boiler Do I Have?
How to use the cylinder, loft tanks, pressure gauge and expansion vessel to identify combi, system, regular and oil boilers.
Combi Boiler: Is It Right for Your Home?
How to decide whether a combi boiler, system boiler or cylinder setup fits the way your household uses hot water.
What size boiler do I need?
Hot-water demand, heat loss and minimum output, beyond bedroom and radiator counts.
Electric combi boilers
Where they fit, their hot-water and electrical limits, and the alternatives to compare.
Looking after it
Servicing, settings and system care
Find service prices and preparation advice, understand the different checks and read about settings and the wider heating system.
Boiler service prices
Our gas, LPG and oil service prices, what is included and when to book a fault visit instead.
How Long Does a Boiler Service Take?
Real gas, LPG and oil service times, what faults add and why known problems need reporting before the visit.
Boiler Service vs Gas Safety Check
Compare the checks, paperwork and landlord duties, then see when you should book both.
Boiler temperature settings
Heating flow, tap water and stored hot water are different settings. Start with your boiler type.
Power Flush Cost
What a power flush usually costs, when a full flush is worth it, and when a lighter clean may be enough.
LPG boilers and corrosion
Liam’s observations, the chemistry and what the evidence can and cannot explain.
Why Our Boiler Service Plan Is Different
How our boiler service plans are built around real condition, local support and clear terms.
Need help with your boiler?
For a current fault, use our repair service. For a planned replacement, start with our installation page. The office can also help you arrange a routine service.
Considering a change from a boiler? Explore our heat pump guides, or browse all Insights.