Guides
Boiler, air conditioning & heating guides
Written by engineers rather than copywriters — how the work is done, what drives the cost, and which option genuinely suits your house.
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Boilers guides
22 in-depth guides on boilers.
Costs, explainedWhat a new boiler actually costs in the UK, line by lineAppliance, labour, parts and system work are four separate numbers. Once you can see them apart, quotes stop being confusing.Choose the right typeCombi, system or regular: which boiler type suits your home?The three types are not better and worse versions of each other. They solve hot water in three different ways, and your house decides which one works.Honest comparisonComparing combi boilers honestly — without a fake top tenThere is no single best combi boiler. There is a best combi boiler for your mains flow, your radiator load and how long you plan to stay.Range guideWorcester Bosch boilers: the ranges and what separates themFour names, one brand, and a genuine spread of capability between them. Here is what changes as you move up the range.Repair or replaceNine signs your boiler is telling you it is nearly finishedBoilers rarely fail without warning. They get noisier, less responsive and more expensive to keep going, usually over a couple of winters.The processBoiler installation day by day: what actually happens in your houseSurvey, strip out, pipework, hang, flush, commission, handover. Knowing the sequence tells you whether a job is going well.ServicingWhat a proper annual boiler service includes — and what it does notA service is a set of measurements. If nothing was measured and nothing was written down, you did not have one.Cost breakdownBreaking a boiler installation cost into the work behind itThis page ignores the appliance price entirely and looks only at the other half of the invoice — the day or three of work.SizingSizing a new boiler: why bigger is usually worseOutput is measured in kilowatts, and the correct figure is smaller than most people assume — often much smaller than the boiler being removed.ConversionsRemoving the cylinder: what a combi conversion involvesA conversion reclaims a cupboard and a loft. It also changes how your hot water behaves for good, so it is worth going in clear-eyed.Technical requirementsFlue positions and condensate routes: the rules that decide where a boiler can goTwo unglamorous pipes — one taking exhaust out, one taking acidic water away — set most of the constraints on boiler position.LifespanHow long a boiler lasts, and what shortens itTwo identical boilers fitted on the same street can be eight years apart at the end of their lives. Almost all of that gap is avoidable.Buying adviceThree boiler quotes, three different jobs: how to compare them properlyTwo quotes for the same house can describe completely different pieces of work. Comparing the totals first is how people pick badly.SymptomWhy does my boiler lose pressure overnight?Short answer: water is escaping. A sealed system cannot lose pressure without losing water, or without a failed expansion vessel faking the drop.NoisesBoiler making a kettling or rumbling noiseKettling is not a quirk of an ageing boiler. It is the sound of localised boiling inside a heat exchanger, and it shortens the appliance's life.Living through itHow disruptive is having a boiler replaced?The honest version: one or two days without hot water, some drilling, dust sheets in one or two rooms, and a normal evening at the end of it.NoisesWhy is my boiler whistling?A whistle is a pitch, and pitch comes from something narrow. Find the narrowing and you have usually found the fault.NoisesBoiler humming or buzzing: is it dangerous?A hum is a vibration looking for something to resonate against. Most of the time that something is the pump, the fan or the cupboard the boiler lives in.PaperworkHow to check your boiler has been registered"Registered" means two different things for a boiler, and people often only check one of them. Here is what each is and how to confirm it.Boiler typesBoilers with water tanks: which types have one and whyThe tank question is really a hot water question: store it in advance, or heat it the moment you open the tap.Gas Safe workBoiler engineer near me: booking the right gas engineerEvery boiler job is gas work. The registration, not the job title, is what makes an engineer legal to open the casing.ReplacementCombi boiler replacement: what the job involvesLike-for-like sounds simple, and often is. The details that turn it into a bigger job are worth knowing before the survey.
Air conditioning guides
10 in-depth guides on air conditioning.
Options guideHome air conditioning in a British house: the realistic optionsBritish houses were not designed for cooling, which is why the interesting question is not which unit — it is where the indoor and outdoor halves can go.Installation processAir conditioning installation, from survey to vacuum testThe parts you will notice take an hour. The parts that determine whether the system lasts fifteen years take most of the day.Cost breakdownWhat drives air conditioning installation costs up and downEquipment is the predictable part of the bill. Distance, access and how many rooms share a system are what move the number.System designOne outdoor unit or several? Split against multi-splitMulti-split looks obviously better on a drawing: fewer boxes outside. Whether it is better in use depends on how the rooms are actually used.Running costsWorking out what air conditioning actually costs to runYou can calculate this yourself in about a minute, provided you use input power rather than cooling capacity.ComparisonPortable air conditioner or fitted system? An honest comparisonPortable units are not a scam. They are a compromise with a specific shape, and knowing that shape tells you whether it fits your problem.Year-round useUsing air conditioning as heating through the British shoulder seasonsMost fitted systems already heat. Nine out of ten households simply never press the button, and October is when it earns its keep.SitingChoosing where the indoor and outdoor units goSiting is where comfort, noise, neighbours and future maintenance costs are all decided at once — usually in the first twenty minutes of a survey.Fault findingAir conditioning dripping water inside the roomCooling air always produces water. When that water appears on your wall instead of outside, the drain has failed somewhere along its length.Rules and consentDo I need planning permission for home air conditioning?Usually no, for a house. But flats, listed buildings and conservation areas change the answer, and there are conditions attached even when consent is not needed.
Central heating guides
10 in-depth guides on central heating.
New systemsInstalling central heating from scratch: the order of workA new heating system is mostly a design job. By the time anyone lifts a floorboard, every radiator size should already be decided.Emitter choiceRadiators or underfloor heating with a new system?Both distribute the same hot water. They differ in response speed, floor depth, flow temperature and what you can lay on top.Controls & zoningZoning and controls: the cheapest heating upgrade nobody buysThe most efficient boiler on the market, controlled by one thermostat in a draughty hallway, will still heat your house badly.RadiatorsNew radiators: sizing, replacing and balancing them properlyMost cold-radiator complaints are not about the radiator at all. They are about how the flow is shared between all of them.Cost factorsWhat affects the cost of flushing radiators?There is no honest single price for flushing radiators, because the job ranges from one radiator in a sink to a whole-system clean. Here is what moves the number.Hot waterConverting a vented cylinder to unventedYou can't just connect an unvented cylinder to a vented system. You can replace the system — and whether that is worthwhile depends mostly on your mains supply.LeaksLeaking radiator: how to find the leak and fix itWhere the water comes from decides the fix. A weeping nut is a spanner job; a pinhole in the panel means a new radiator.Choosing an engineerHeating engineer near me: what they do and how to pick oneThe right person for a cold radiator is not always the right person for a gas boiler. Knowing the difference saves a wasted visit.RepairsCentral heating repair: finding the fault before fixing itHeating faults are rarely where they first appear. A cold bedroom can be a valve, a pump, a control or the boiler itself.ControlsSmart thermostat installation: what to expectThe thermostat on the wall is the easy part. Whether it can talk to your boiler properly is what the installation is really about.