Fire not burning hot enough [Twin- Wall System]

If you have a rigid pipe system connected to your stove and it was installed before 2010 there is a good chance that the pipe exiting the roof is not long enough. This stops your stove from receiving the optimum amount of air to make it burn efficiently. Before you blame the stove and waste money on a new one, you may want to try extending the length of pipe above the roof. In order to do this though we will need to know the exact make and model of the twin wall rigid pipe system as they are not interchangable.

Give us a call on 01462 431910 to arrange a free survey or send us a message from our website :

Stove Output Calculator

Woodburner or open fire?

Sometimes people think that a fire is simple a fire and that installing a woodburner is an unnecessary expense. Some people think it is better to renovate the original fireplace rather than destroy a piece of history.

So, if you have a fireplace that is bricked up, or an old fireplace in need of some TLC. and you are trying to decide between fitting a wood-stove and an open-fire here are a few things to think about.

Open fire

  • Cheaper to renovate existing fireplace.
  • Not guaranteed that the fire will draw well when complete. May need a gathering hood fitting inside the chimney.
  • Soot attacks the brickwork, leading to extra maintenance or repair.
  • Very prone to differing weather conditions, often goes into reverse sending smoke inside the house.
  • Need to have fire baskets and fire back repaired or replaced eventually
  • In old houses with new double glazed windows there is left draught so open fire struggles to find enough oxygen to burn well.
  • Only 15% efficient so burns through fuel about 5 times as fast.
  • Difficult to burn at optimum temperature as no thermometer.
  • Most of heat generated is lost up the chimney.
  • More storage space needed for fuel and more deliveries.
  • Smoke is less clean than from a wood burner and causes air pollution.
  • Debris often falls back into room causing damage to floor, carpet or belongings. 
  • Fire risk! Can’t be left unattended or turned down!
  • New installations in houses without a fireplace will need a lined flue.
  • If used regularly will need sweeping at least one per year

Wood or multi-fuel stove

  • More expensive to install than to renovate an existing open fire.
  • Good draw produced by lining the chimney, which also protects the brickwork.
  • Firebrick liners inside stove will need repairing or replacing over time.
  • Designed to work with door closed so no smoke inside the house
  • Airflow can be adjusted so that you can burn high or low.
  • Around 70 – 90% efficient so burns through less fuel.
  • Less storage space needed for fuel and fewer deliveries.
  • Low emissions causing far less pollution than open fires.
  • Needs sweeping at the end of every burning season and more often if you only burn wood.
  • Multi-fuel models can burn both wood and coal.

Open fires have been around since cavemen time. Log burners have been designed over time because of the need to improve on the original.

Open fire place with fire basket

Above is a photo of the old open fire in Molly Malones Public House, Hitchin. Below is the Oregan 8kW multi-fuel stove that replaced it after refurb. Which do you prefer?

The good news is that whichever way you decide to go, we can help you with your project. If you would like to arrange a free survey to see how much your install or renovation will cost; drop us an email to or call 01462 671555

Do I need an Anti-Downdraft Cowl?

Does your open fire have a weak draw of air whilst burning? Even after its just been swept? Do you you find that the air in your room is smokey when the fire is on? Do you find you only have these symptoms on odd occasions such as windy days? Chances are you need an Anti-downdraft cowl. There are many available for purchase so check with your chimney sweep before buying one.

Please note that anti-downdraft cowls are not designed to stop drafts coming down the chimney when the fire is not in use.


How can I get a discount on my installation?

If you can wait until Summer then we can offer you a discount as this is traditionally our quiet period. This year however, we are already fully booked until the end of July and can only fit in 4 more full installs before the busy season starts again in September.

Thus if you are a bargain hunter, now is the time to book in your survey. Give us a call, or drop us an email on to arrange.

Do you accept credit cards

Unfortunately we have decided that we are no longer able to accept credit cards nor debit cards. This is because of the new legislation that stops us from adding the cost of the bank charges for processing the transaction to the bill. This on average is around £60 per customer, and would mean increasing all our prices at the quotation stage, for all our customers, regardless of how they are planning to pay, and also purchasing a hand held device that costs around £300.

In the last year only 2 customers have asked to pay by credit card and so for the time being, we would rather keep costs low and so ask that our customers pay by cash, cheque, bank transfer or PayM.

Need a good chimney sweep?

Our sister company Cleansweep Vac Services has been in the business for over 25 years and can bring a wealth of experience and expertise to your chimney and fireplace. They will provide you with a certificate for your insurance company to say that the chimney has been swept to industry standards and for small fee can provide a HETAS certificate for you as they are now HETAS approved.

You can book a chimney sweep online at or over the phone on 01462 671555. Please note that you have to book in the sweep as a HETAS sweep as HETAS certificates cannot be supplied retrospectively.

Use the coupon code WEB5 to save yourself £5. (online only)
There are also discounts for multiple sweeps in one location (house or street)

How often should I sweep my chimney?

Sweeping, Chimney Maintenance and repair, servicing of woodburners, fireplace installation and cowling fitting in the Hitchin area and surrounding villages. Take a look at the areas covered.

A chimney sweep can take anywhere from 20 mins (well looked after burners, burning at the correct temperature and burning good quality fuel) to 60 mins (large open fires burning high volumes of fuel). If you have a birds nest it could literally take hours to clear, so fitting a bird guard could be wise if you notice flocks settling on your roof.

Flexible times to suit you. Appointments available from 7:30am to 6:30pm during the week and between 10am and 4pm at the weekend.

How much does a woodburner installation cost?

To be honest its hard to say, which is why we need to visit and take a look at what you already have, before quoting you for the job.

Each chimney stack is unique, even the house next door probably has a slightly different set up to yours and without taking a look at the age of the house, the height of the stack and its state of repair and the fireplace area it would be impossible to quote you accurately.

If you are thinking of buying a woodburner and having it installed, I would make sure that you have at least £1500 put aside (including VAT) and that you get quotations from HETAS registered installers, so that you make sure that you have a safe installation and can cut out the planning permission process. Contact GTD Installations to arrange a free site survey today.

How long will it take?

It depends on what you want done. A flexible liner install will be completed in under one day, a wood burner or solid fuel stove will take a whole day and installations also involving hearths, fireplaces and opening up a blocked off chimney may need 3 or 4 visits. If you require a new hearth, we will measure up one week before, so as to allow plenty of time for the stonemason to cut it to the size needed.

Choosing a High Rated Stove?

Choosing a wood burning or multifuel stove can be mind blowing. There are literally thousands to choose from!

Maybe you have a really cold room and like to be hot and are thinking of buying a stove that is hotter than recommended for your room size. Maybe you are wanting a stove larger in size to fit a large fireplace and have not considered the increase in kilowatt output. If so, there are a couple of important things to think about.

One, you are obviously going to be really hot and will need a lot of fuel to burn. A high kilowatt stove doesn’t magically turn the fuel into higher heat, they burn more fuel to create the heat!

Two, if you are too hot and because of this burn small fires to keep the heat down, or use with the air flow turned very low, you will be burning the fuel inefficiently which will produce more soot and let more pollutants into the atmosphere. A fire burning inefficiently produces a lot of soot that will coat the inside of your liner and run the risk of a fire in the liner, which could spread to the house. Also any soot left sitting in the liner over time, will corrode the liner which will mean it will not last the recommended time suggested by your installer or the manufacturer of the liner. Thus needing replacing more often than the usual 10 years.

A high kilowatt output stove should be installed in a large room, or a open plan room, or a large draughty room. Any stove over 5kw will also need a permanently open air vent to feed air to the stove in order to work properly and safely. A stove pipe thermometer would also be a must, so that you can see when your stove is operating at an optimum temperature and not getting too hot or cold. Bearing in mind that around 38% of air pollution comes from open fires and old woodburners and / or people burning unseasoned wood or house coal, it makes sense not to add to those figures  by making sure your installation is the cleanest it can be.

Always check with your installer or use an online calculator to work out the ideal size output for your room. Take a look at some high kilowatt stoves on

Here are some helpful ‘Do’s and Don’ts’ from the burnright website.

Answers to your woodburner and chimney sweeping questions. Contact us if you have a different question.