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Published by Mo's Plumbing and Heating
How Much Is a New Boiler?
Everyone wants one number and the honest answer is that the boiler is rarely the expensive part. What you pay depends far more on what has to happen around it, and in Glasgow property that is mostly about where the flue can legally go and what the pipework is doing. Here is what actually moves the figure.
The Short Answer
We fit new boilers from £699 including VAT, supplied and fitted, and the final price is confirmed on the call or the visit. That is a starting point rather than a typical price, because a straight like-for-like swap in an accessible position is a very different job from moving a boiler across a room, converting from a tank system to a combi, or rerouting a flue in a tenement. The survey is free and the fixed price comes out of it, so you get your actual number before anything is agreed.
What You Are Actually Paying For
A boiler installation is four things, and only one of them is the appliance. The boiler itself, the labour to fit it, the materials around it, and the work created by the position it has to go in. People shop the first one and get caught by the fourth.
The appliance varies by output and by brand, and there is a genuine spread between a budget unit and a premium one, mostly in build quality, warranty length and how easy it is to get parts. The labour on a straightforward swap is broadly predictable. Materials cover the flue, the filter, valves, fittings and any pipework that has to be remade.
The fourth is where quotes diverge wildly for the same house. Two identical flats can produce very different numbers because in one the boiler stays exactly where it is and in the other it moves three metres, and moving it means new gas, water, condensate and flue routes plus making good afterwards.
This is why a quote given over the phone without seeing the property is close to meaningless, and why anyone confident about your price before looking is guessing at your expense. Our survey is free precisely so the fixed price that follows is a real one.
The Things That Push the Price Up
In rough order of how much they add, and any one of them can turn a simple job into a substantially bigger one.
- Converting a tank system to a combi. This is the big one. You are removing a cylinder and usually a loft tank, capping and stripping redundant pipework, rerouting the hot supply, and making good the cupboard you have just emptied. It is a different job from a swap.
- Moving the boiler. Every service the boiler needs has to follow it, plus a compliant flue route from the new position, plus repairs to walls and units where the old one was.
- Flue routing. A flue has minimum distances from windows, doors, air bricks and boundaries, and it has to terminate somewhere it is permitted to terminate. Where the easy route is not available the answer is a longer run, a vertical flue through the roof, or a different boiler position, and each costs more.
- The state of the existing system. A system full of sludge needs flushing properly before a new boiler goes on it, and skipping that is how a new appliance gets a blocked heat exchanger in its second year. Most manufacturer warranties expect it.
- Gas supply capacity. An older, smaller gas run may not deliver enough for a higher output boiler, and upgrading the run back to the meter is real work, particularly in a flat where the meter is in a close cupboard two floors down.
- Access. A boiler on the fourth floor of a walk-up with no lift, or a flue position needing a tower or scaffold, adds time and equipment before anyone touches a pipe.
- Removing a back boiler. Behind-the-fire units are labour-heavy to strip out and often reveal a fireplace that needs making good.
The Things That Do Not Move It As Much As You Expect
Worth saying, because people spend a lot of energy on these and comparatively little on the list above.
Brand, within reason. There is a real difference between the budget and premium ends, but the gap between two respectable mid-range manufacturers is usually smaller than the difference one awkward flue route makes. We are manufacturer certified for Worcester Bosch, Vaillant, Baxi, Ideal and Vokera, and there is no single right answer across all of them for every property.
Output size, up to a point. A bigger boiler is not proportionally more expensive, and oversizing is a genuine problem rather than a safety margin: a boiler too large for the property short cycles, which is less efficient and harder on the components. The right size comes from the heat requirement and the hot water demand, not from picking the biggest that fits the budget.
Time of year, mostly. Winter is busier, but the work is the same work. What changes in winter is availability rather than the quotation, and the practical argument for doing this in summer is that you are not without heating while it happens.
Repair or Replace
The question behind most searches for what a new boiler costs is really whether this one is worth keeping, and that deserves a straight answer rather than a sales one.
Age matters but is not decisive on its own. A well maintained boiler in its early teens with parts still available can be worth repairing. The things that tip it are parts availability, whether the fault is in an expensive component, and how many times you have already called someone out.
The rough test we use: if the repair is heading towards a meaningful fraction of a replacement and the appliance is old enough that other components are near the end of their lives too, you are buying a short extension rather than a fix. One isolated fault on an otherwise sound unit usually is worth repairing, and we will tell you when that is the case even though the other answer is worth more to us.
Where parts are obsolete the decision makes itself. Where the heat exchanger has gone on an older appliance it usually makes itself too. Everything in between is a judgement, and it is one you should be given the numbers for rather than talked into.
How Long It Takes, and What Happens
A straight like-for-like swap in an accessible position is usually a single day, with heating back on the same evening. A conversion from a tank system to a combi is more often two days, sometimes three where a lot of redundant pipework has to come out and be made good.
The sequence is fairly consistent: the system is drained, the old appliance and flue come out, the new position is prepared, the boiler is hung and connected, the flue is fitted and sealed, the system is filled, flushed and dosed with inhibitor, and then the appliance is commissioned and its settings recorded. The commissioning at the end is not paperwork for its own sake, it is what registers the installation and validates the warranty.
You should be left with the manufacturer's paperwork, the warranty registered, the Building Regulations notification handled, and a filter fitted on the return. If any of those are missing, ask, because the warranty usually depends on them.
Why the Flue Decides the Price in Glasgow
In most of the country the flue is a detail. In Glasgow tenements and conversions it is frequently the single item that determines what your installation costs, and it is the reason two quotes on the same street can differ by a lot without either being unreasonable.
A flue has to terminate a set distance from openings, boundaries and air bricks, and a traditional tenement gives you a rear elevation crowded with windows, a light well, a shared back court and neighbours' openings within those distances. Where the obvious route is not compliant, the options are a longer horizontal run, a vertical flue taken up through the roof, or relocating the boiler to a wall where the termination works. All three cost more than a short flue straight out through a gable, and none of them is optional.
The second Glasgow factor is permission. In a flatted building the external fabric and often the roof are common property, so a flue through a shared wall or roof is not purely your decision. If the building is factored, the factor is the route to that permission. Neither of those is a plumbing problem, but both take time and both need starting early, because they will hold up an installation that is otherwise ready to go.
Then there is the conservation and listed question. Large parts of the West End, the city centre and pockets of the Southside sit in conservation areas, and there are listed tenements throughout. Where a building is listed or in a conservation area, what can be fitted to a visible elevation is constrained, and that is a conversation to have with the council before the boiler is ordered rather than after. Worth checking your address at the survey stage, since it occasionally rules out the cheapest arrangement entirely.
The practical upshot is that the free survey earns its place here more than it would in a modern estate house. Half of what we are looking at is not the boiler at all, it is where the flue can go and what that implies.
When to Call Someone Out
Worth a call once you want a real number rather than a range, because on this job a range is not much use to anyone. The survey is free on installations and replacements, it is where the flue route and the system condition get established, and the fixed price comes out of it. New boilers are supplied and fitted from £699 including VAT, with the final price confirmed on the call or the visit. Mo and Muhammad are both Gas Safe registered for domestic work and will tell you honestly if what you have is worth repairing instead, which is a conversation worth having before you commit to replacing anything.
Boiler Replacement in GlasgowCommon Questions
We supply and fit new boilers from £699 including VAT, and the final price is confirmed on the call or the visit. It is a starting price rather than a typical one, because the work around the boiler varies enormously between properties. A like-for-like swap in an accessible spot and a tank-to-combi conversion with a rerouted flue are different jobs, and the survey is what turns the starting figure into your figure.
What Locals Say About Mo
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“Our radiator pipe was bent and leaking. They answered straight away… Guy was here an hour later and he was wearing ID, very professional, patient and kind. We just got a new carpet in this room and he done an amazing job on getting little to no water on it. Couldn't recommend enough, price was reasonable.”
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