Month: September 2026

Radiators are the forgotten half of a heating system. People spend carefully on a new boiler, then connect it to the same radiators that were on the wall in 1998 — corroded inside, undersized, and taking up the one stretch of wall where a dresser would fit. Upgrading them is one of the more satisfying jobs we do, because the difference is visible as well as felt.

Why old radiators hold a system back

Inside an ageing radiator, corrosion builds into a sludge that settles along the bottom. That is why old radiators go cold at the base while the top stays hot: the water is not circulating through the whole panel. Output drops, the boiler works harder to compensate, and rooms take longer to warm up. Single-panel radiators from the 1990s were also frequently undersized for the room even when new.

Modern panel radiators produce more heat from a smaller footprint, so an upgrade often means a better-heated room from a physically smaller unit. That is where the space starts coming back.

Vertical radiators: the answer to the wall-space problem

Vertical radiators use height instead of width. Instead of a metre and a half of wall that can never be used for anything else, you have a tall, narrow unit occupying a fraction of the space — often somewhere previously written off, like the strip beside a door or the return wall of a chimney breast.

The question we get asked is whether they are less efficient. The honest answer: in pure physics, marginally. A radiator draws cool air in at the bottom and releases warm air at the top, and a wider radiator draws in more air across its length. In a tall, narrow unit the air is largely up to temperature before it reaches the top, so the upper section does less work.

In practice this rarely matters, for two reasons. First, what counts is whether the radiator meets the room’s heat requirement, calculated properly in BTUs — if it does, the room is warm, and the shape is irrelevant. Second, horizontal radiators are constantly obstructed by sofas, curtains and units, which costs far more output than the theoretical difference. A vertical radiator on a clear wall frequently outperforms a horizontal one buried behind a corner suite.

The catch is that a vertical needs correct sizing and, usually, pipework moved — which is why it is worth having done properly rather than swapped like for like.

Kitchens: where every wall is already spoken for

Kitchens are the hardest room to heat well, because the walls are units, splashback, appliances or glazing. There is often nowhere sensible for a conventional radiator, and the one that is there blocks the only free run of worktop. Three options usually solve it:

• A vertical radiator on a narrow section of wall — beside a door, at the end of a run of units, or on the return by a window. Often the neatest answer in a kitchen-diner, where it can be a design feature rather than something to hide.
• A plinth or kickspace heater, fitted into the kickboard beneath the units and connected to the central heating. It is completely invisible, frees the wall entirely, and warms the floor area where you stand. In a small kitchen this is frequently the best solution available.
• Underfloor heating, if the floor is coming up anyway. Highest cost and most disruption, but it removes the problem permanently and suits a tiled kitchen floor well.

Elsewhere in the house the same thinking applies: skirting-level heating along a wall in a room with no free space, a tall narrow radiator on a landing, or a heated towel rail in a utility doing two jobs at once.

The part most people miss: size them for lower temperatures

This is the point worth taking away. Most homes run their boiler hotter than they need to. Turning the flow temperature down lets a condensing boiler actually condense, which is where its efficiency comes from — the Energy Saving Trust points to research from Nesta showing that dropping to around 60°C improves boiler efficiency by close to 4%.

The reason people turn it back up is that their radiators are too small to heat the room at a lower temperature. Fit slightly larger or higher-output radiators and that constraint disappears: you can run the boiler cooler, permanently, and still be warm. The upgrade pays you back every month.

It also future-proofs the house. Heat pumps run at much lower flow temperatures than boilers, and the single biggest cost when converting is usually replacing radiators. Sizing generously now means that decision is already made, whenever you come to it.

Timing, and doing it properly

If you are having a kitchen or bathroom refitted, sort the heating before the units go in. Moving pipework is straightforward with the floor up and the walls bare, and awkward and expensive afterwards. Tell us at the planning stage, not when the fitter is on site.

And when radiators are changed, the system should be flushed, dosed with inhibitor and properly balanced afterwards, with a magnetic filter fitted if there is not one already. New radiators plumbed into dirty water will be sludged up again within a few years.

Talk to us about your radiators

We install, replace and upgrade radiators across Halesowen, Stourbridge and the surrounding West Midlands — vertical radiators, designer panels, plinth heaters and full system upgrades. We will size them properly for the room rather than guessing from what is already on the wall. Call 0121 503 0066 or use our contact form.

 

 

Ask people what puts them off having heating work done and very few say the cost first. They say the disruption. The dust sheets that never appeared, the black water on the hall carpet, the brick dust trodden through the house, the old boiler left propped against the garden fence for a fortnight. Plenty of people put off a job they know needs doing because of what happened last time.

Clean working is not a nice extra on top of good engineering. It is part of it. Here is what it actually involves, so you know what to expect from us — and what to ask of anyone else you let into your home.

Heating work is messier than most trades, and that is the point

Fitting a kitchen makes sawdust. Heating work involves opening up a system that has been sitting closed for years. The water inside an older central heating system is not water as you would recognise it: it is black, it smells, and it is full of iron oxide sludge that stains carpet permanently on contact. Add lifted floorboards, drilling into brick, cutting a flue hole through an external wall and carrying a cast-iron boiler down a staircase, and you have a job with genuine potential to wreck a house.

Which is exactly why the preparation matters more here than almost anywhere else. A good engineer spends the first half-hour of a boiler swap not touching the boiler at all.

What good preparation looks like

• Protection along the whole route, not just the work area. Sheets from the front door to the boiler, because the mess travels on boots and on the boiler being carried out.
• Overshoes on, every time. Including the fourth trip back to the van.
• Furniture moved properly and covered, not shuffled aside and worked around.
• Doorways closed off before any cutting or drilling starts, so dust stays in one room.

The sludge problem, and how it should be handled

This is the one that ruins homes. Draining a heating system releases every bit of corrosion that has built up inside it over twenty years, and it does not come out politely. Done carelessly it goes on carpets, skirtings and grout, and it does not come out again.

Done properly, the system is drained through a hose run out to a drain outside, radiators are lifted and carried with the ends capped and a tray underneath, and anything that does escape is caught before it touches a floor. When we power flush a system, the machine and its waste stay contained. It is not complicated work, but it is the difference between a tidy job and a new carpet.

Dust, and the twenty minutes at the end

Cutting a flue hole through a cavity wall produces a remarkable amount of brick dust. It should be extracted at source and vacuumed as it is made — not swept up afterwards, which just moves it into the air and onto every surface in the room.

Then there is the part that separates the good jobs from the acceptable ones: the last twenty minutes. Hoovering the room properly rather than kicking the worst of it up. Wiping down the boiler casing and surrounding tiles. Putting the furniture back where it came from, not roughly nearby. Taking the old boiler, the old radiators, the packaging and every offcut away with us, on the day. Then walking round with you before we leave.

That is the standard we work to. When we finish a job, the only evidence we were in your house should be the thing we came to fit.

Why it matters beyond good manners

Tidiness on site tends to reflect tidiness in the work itself. An engineer who leaves a clean floor is usually the same engineer who clips pipework straight, boxes it in neatly, makes good around the flue properly and labels the controls. An engineer who does not care about your hall carpet is unlikely to care much about what the pipework looks like once the casing is on.

There is a safety dimension too. In properties built before 2000, drilling or cutting can disturb materials that need identifying first — Artex ceilings and some older flue components among them. A competent engineer knows to stop and assess rather than cut first and find out later. That habit of care is the same habit that puts the sheets down.

What to ask before you book anyone

• Will you sheet the route in as well as the room you are working in?
• How will you drain the system, and where does the old water go?
• Are you taking the old boiler and packaging away on the day, or am I disposing of it?
• Will you make good around the flue and the pipework?

Any engineer worth having will answer all four without hesitating, because they have thought about it before. A vague answer tells you what the finish will look like.

Heating work without the mess

We are a family-run, Gas Safe registered heating firm based in Halesowen, working across Stourbridge and the surrounding West Midlands. Which? Trusted Traders, with over 40 years of collective experience, and a great deal of that experience is in other people’s homes — which is why we treat them accordingly. Call 0121 503 0066 or use our contact form for a quote.