How long does it take to replace a boiler Re February 6, 2023

How long does it take to replace a boiler

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How long does it take to replace a boiler?

We get asked this question a lot at WarmZilla HQ and while it can be difficult to give an exact answer as there are so many variables (sorry to sound like slippery politicians), we will try and give you a rough idea of how long each type of boiler replacement takes.

Combi to combi swaps, system to combi, back boiler to combi – we’ll break through the jargon and explain how long your boiler replacement will roughly take. 

In addition to the standard boiler installation time, there are extra variables which can add a bit of time to replace your boiler – such as chemical flushes, smart thermostats or installing a system filter – don’t worry, we’ll break these down too and give you a clear idea of how long it will take to install your new boiler.

The good news is that we’ve made the process of getting a quote on a new boiler and purchasing it with installation as quick and easy as possible – it will only take a couple of minutes to buy a boiler with WarmZilla. If only everything could be so simple eh?

Combi to Combi Swap (Approx. 4-6 hours)

Let’s start with the most simple scenario, swapping out a combi boiler for another combi boiler.

Perhaps your current combi has done its time and given you 15 warm years and now it’s ready to hang up its heat exchanger or perhaps you’ve seen the new Worcester 8000 Lifestyle range and think it would look pretty good in your kitchen. Whatever the scenario, any like-for-like boiler swap is music to the ears of any heating engineer.

Barring any unforeseen incidents, a good engineer will have your new boiler fitted between 4 -6 hours and be home in time to watch Countdown (or whatever engineer’s watch).

Standard/System Boiler to Combi Swap (Approx. 2 days)

This is where things start to get a bit more complicated. A system boiler has a separate water tank that will need to be removed if you switch to a combi boiler. Likewise, a standard boiler has a separate hot water storage tank and a water feed tank usually located in the attic. Removing the additional tanks and removing and/or rerouting the pipework to the new combi boiler adds time to this particular kind of swap.

This means there is a bit more disruption to your home during the installation process as floorboards will need to come up. Our installers will minimise the disruption as much as is humanly possible but they will require the occasional tea break with biscuits to refuel. 

All additional pipework and old water tanks will be removed from your property, and it will be left as though our installers had never been, other than the installation of a nice new, efficient boiler.

The advantages of switching from a standard/system boiler to a combi boiler are that you take back the space that the tanks were using up in your home, usually in an airing cupboard and/or the loft. Combi boilers are more energy-efficient than system and standard boilers as you will inevitably lose some heat from the hot water storage tank

Additionally, combi boilers heat water as it is needed, so you won’t run out of hot water but with standard or system boilers once you’ve used up all the hot water in the storage tank then you will have to wait for it to heat up again.

For more info on the different types of boilers available, we’ve created the perfect blog for you and called it ‘Boiler Types Explained’ – catchy right?

Back Boiler to Combi Swap (Approx. 2-3 days)

Back boilers are often the most difficult system upgrades to install. If you’re having issues with your back boiler, the chances are that parts are no longer available for them as they are quite old and extremely inefficient.

Back boilers last for around 25 years, so if yours is on its last legs the chances are that it has had a good innings and has earned its rest in back boiler heaven – one of the least energy-efficient heavens out there.

Given their location (behind your gas fire), they aren’t easy to remove and the removal is often quite a difficult job and usually quite expensive. It can be quite a messy job as it can involve the removal of the fireplace and the area around the fire to be able to remove it. In some cases, the back boiler can be decommissioned and left where it is so the disruption is minimised.

Having said that, WarmZilla are able to complete back boiler to combi swaps for as little as £2,489.00 or £26.38 on monthly finance – that is an exceptionally good price if we do say so ourselves*. 

Not only that but the boiler we would be installing is the premier make of boiler – Worcester Bosch and it comes with a 5-year guarantee, smart thermostat, system cleanse and a system filter.

Even though you would incur the costs of a new boiler you would also notice quite a saving on your utility bills from the increased efficiency of a new system or combi boiler – so it isn’t all bad news. We estimate you would save around £300 per year on your bills by upgrading your system to an energy-efficient combi boiler.

If you want to see how much it would be to swap your old, inefficient back-boiler out for a modern combi or system boiler then take our survey now, it only takes a couple of minutes and you’ll be given an instant online price. Or you could use our Boiler Comparison tool, which allows you to compare your current boiler with other boiler models or brands or compare three new boiler models, to help you find the most suitable boiler for your home. 

Moving your Boiler Location (Approx. 0.5 days)

Another factor which can impact how long it will take to get a new boiler installed is whether it will be located in the same place or whether you want to move it elsewhere in your home. 

The average time it takes to relocate a boiler within the same home is half a day, but obviously, this depends on the size of your home. If you want to move your boiler from the East Wing to the West Wing, then the cost will be higher as the ‘gas run’ will be longer.

Gas run refers to the pipework that connects your boiler to the mains gas supply coming into your property. As a general rule, the further away you move your boiler from its current position, the more it will cost as the gas run will be longer. Your pipework will run under floorboards and through walls so there aren’t unsightly copper pipes everywhere and as you can imagine, rerouting the pipework is a fair amount of work.

Non-Regulation Gas Supply Pipe (Approx. 0.5 days)

Gas Safe legislation dictates that the gas supply pipe should be 22mm thickness, older systems may still have 15mm pipe. What’s 7mm between friends you may ask, but this is a legal requirement and the supply pipe will need to be upgraded before work can commence.

This will add on average half a day to your boiler installation.

Smart thermostat (Approx. 1 hour)

Every boiler installed by WarmZilla comes with a smart thermostat included in the price. Smart thermostats are handy little devices that allow you to control your heating remotely from your mobile phone.

They give you more control over your heating and as such save you money on your bills by working more efficiently. Tado says that its smart thermostat ‘will pay for itself within a year’ by reducing your heating bills by up to 31%. Netatmo claims that its smart thermostat will reduce the energy you use by 37%.** 

You can read more about the savings a smart thermostat can provide as well as other great ways to save on your heating bill.

Powerflushing or Chemical flushing (Approx. 2-4 hours)

Powerflushing involves connecting a machine to your system that targets sludge and other build-ups in your system by dislodging it with a high-pressure water flow along with a powerful system cleaning agent.

We wouldn’t recommend this process for newer systems as it would likely be a waste of time and money. A powerflush can cost between £300 -£500 so in many cases, rather than cleaning out an old system you would be better off putting the money toward getting a newer system. With boilers starting from around £1800 for a top of the range Worcester Bosch, boilers are more affordable than ever – especially with one of our boiler finance plans.

For more info on chemical flushing and other ways to increase your boiler lifespan, you can view another helpful WarmZilla blog article.

When is the best time to have a new boiler installed?

Summer is the best time to replace your boiler. If for any reason the installation goes over the estimated time or it is one of the more complicated boiler replacements then you won’t be as inconvenienced if you find yourself without hot water or heating. 

Our WarmInstallers do everything within their power to ensure that if a job can’t be completed within a day that you are left with hot water and heating.

If your boiler is in need of replacement, don’t wait until it breaks down completely before getting it changed. Nobody likes spending money on a new boiler but our finance packages start from as little as £10.68 per month, that’s less than most boiler insurance cover fees per month! Leisurely picking your new boiler out in the Summer is preferable to panic buying from the only company available that day in the cold of Winter.

Get your fixed price quote in minutes by taking the WarmZilla online survey and we’ll recommend the perfect boiler for your home.

The majority of boiler installations are fairly smooth and the installation is completed within a day or if it’s a more complicated system upgrade – then we can still leave you with hot water and heating for the evening. 

If you’re unsure what boiler is best for your home, we have listed a few blogs below that may be able to help you decide: 

Or you can use our amazing Boiler Comparison tool to compare up to three boilers and choose the best one for you and your family! 

If you have any questions regarding a potential install then please contact us.

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