No hot water?


Scalgon are the UK’s leading experts in limescale removal. Primarily the descaling of secondary hot water heat exchangers in combination (combi) boilers, but also thermal store systems such as Gledhill mains-pressure hot water stores. We offer a premium service, and backed with over 40 years experience. We have been used by British Gas, Thames Water, Reading Borough Council, Reading University, McCarthy & Stone, and very many housing-management and letting companies - and of course, very many plumbing and heating engineers use us too.

We love this! Truth is, we like a challenge. And we’ve been set many challenges by limescale for over 35 years now. We like it best when someone says we won’t be able to do it! We break limescale down (sometimes in just a few minutes) by using a acid/water solution - sent through your pipes by our clever little machine. Most of our work is descaling combi boilers. As combi boilers use mains water then they are prone to limescale formation. There are also thermal store hot water heaters. And often there are just pipes that need descaling with our magic!...

And remember, ‘It’s what we say, or you don’t pay’...

if we can’t descale it, then we don’t charge!!! Yes, really.*

And unlike so many ‘engineers’ we tell you right here, in advance, how much it will cost. For descaling a combination boiler it’s £229 (all inclusive). For descaling a thermal store it’s £329 (all inclusive). For descaling pipework it’s £229 (all inclusive). You pay NOTHING else.*

*Please note that this applies within the RG postcode ONLY


How to book an appointment:

Make contact with us (preferably email or text, please), We will allot you a date (a.m./p.m. your choice). If you are not going to be present during the work, then there is a requirement to make payment before we visit - by card or bank transfer. But if you can be there, then you can pay by cash, cheque, bank transfer, or even card.


If you would like a CombiBuddy fitted (to stop the limescale coming back) or a LimeStop fitted (to protect a thermal store, or home, against limescale) please let us know before we visit. See panel to the right.


Please note that we have to park outside of the property, as our equipment is heavy. We ask you to read our terms & conditions (link below) and ensure that you know where your stop cock is, that it works, and that it does turn off the water supply to your boiler. If it turns off other homes, then that isn’t it!


So, which do you have, a combi boiler or a thermal store?...


Combi boiler?

Combi boilers either have a conventional separate ‘secondary’ heat exchanger, or they have a ‘plated’ heat exchanger. It’s this part which has mains water running through it (to be heated), so it’s this part of your combi boiler that gets all ‘scaled-up’. We can easily descale it by accessing your pipe network via a water in/water out connection. This is why descaling is often better than simply replacing the heat exchanger, as we descale the outlet pipes as well. The process takes about 1-2 hours, and uses a safe acid which is recommended by boiler manufacturers. We do NOT use hydrochloric acid. We don’t usually access the drinking water part of your system, though it is sometimes necessary. If you are a property owner (landlord) and you cannot be there during the work, then it is required that you pay in advance by bank transfer.


Thermal store?

Thermal store water heaters (like Gledhill products) shouldn’t be confused with ‘Heat Banks’. Thermal stores heat cold mains water when it’s needed. A heat bank heats the cold water, then banks it for future use. Thermal store systems (like Gledhill products) have either a plated heat exchanger on the outside of the heater that looks like a steel brick, or it has a coil of pipe inside which is called a calorifier. This acts as a heat exchanger. This coil can get VERY scaled-up, to the point of being completely blocked. But as long as there is some flow, then we can descale it. The process takes 2-3 hours. We use a safe acid which is recommended by boiler manufacturers. We do NOT use hydrochloric acid. If you are a property owner (landlord) and you cannot be there during the work, then it is required that you pay in advance by bank transfer. PLEASE ensure to isolate the heating to your thermal store 36 hours prior to our visit.


For descaling in Reading, and around the Berkshire area, we are the ONLY choice! We do this professionally - we don’t ‘do’ general plumbing, etc. We work in the RG postcode area. The costs quoted above apply throughout the RG postcode area. But we are prepared to travel to:

South Oxfordshire

South Buckinghamshire

West London

West Surrey

North Hampshire

East Wiltshire

We charge a travel fee of £1 per mile ‘round trip’ for any location outside of the RG postcode area, so if the distance to your property is 36 miles, the travel charge would be £72. Check it on Google Maps. Please note that if your property is NOT in the work area outlined above then we cannot help you. Sorry, we don’t go to inner London - inside the North & South Circular Roads, or East London.


We are recommended by Gledhill to descale their PulsaCoil BP thermal stores
See the source image

We also manufacture a range of products, from limescale inhibitors and water filters, to magnetic heating system filters.

See our products below...





Deep Blue

Just £88 +p&p


Stops Limescale


See it at www.limestop.co.uk




The CombiBuddy STOPS limescale in your combi boiler from just £99. It’s absolutely guaranteed!...or your money back


It’s an amazing little device!

It fits on the water supply going to your boiler.

It’s replaced every two years (at a discounted rate). To order, just click HERE




Don’t like the taste of your water?


You can do something about it for just £125


H2Oasis is a very high-quality water filter made specifically for drinking water taste. It has an incredible 0.5 micron filter cartridge inside.

See HERE for more.




Got a thermal store hot water cylinder? In a hard water area, it’s just a matter of time before it scales up. You could pay around £2,000 to replace it.

And yet you can stop it scaling up from just £114...


The LimeStop TS stops limescale in your thermal store - GURANTEED!

See HERE for more.



To see all the products we manufacture, please visit our parent website by clicking HERE

Read our terms & conditions HERE


Read all about limescale inhibitors HERE


For plumbing & heating advice and help, click on thehotplumber.com



Scalgon, 19 Cockney Hill, Reading. RG30 4HF

Tel. 0770 231 6157




Limescale removal & prevention

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Limescale inhibitors

H2Oasis water filters