Elson Coral E Thermal Store Experts When it really matters, we are London’s
The Elson Coral E Thermal Hot Water System was once the number 1 choice of hot water systems to modern flats and properties. The Coral E System originally came in 2x sizes, 150 litre and 210 litre, that said there are many variants of the Elson Coral E range.
- Elson 600i 60 litres of hot water & 60 litres of cold water stored
- Elson Coral B Mark 1 auto fill indirect 100 litre capacity
- Elson Coral B Mark 1 manual fill 100 litre capacity
- Elson Coral B Mark 2 auto fill 100 litre capacity
- Elson Coral B Mark 2 manual fill 100 litre capacity
- Elson Coral E 120 Litre
- E Elson Coral E 180 Litre
- Elson Coral E 300 Litre (very rare)
Elson Coral Si 210 Litre (very rare) these Elson boilers were much more complicated as they were often connected to a district heating system* and/or an external boiler which heated up a primary indirect coil inside the Elson boiler.
*if connected to a District or communal boiler, then there will be a ‘exchanger installed and an additional expansion vessel
Elson would tweek the overall design of the Coral E so that the position of the inlet and outlet pipes, the immersion heaters would vary on each depending on the design specified by the property builder/designer.
Sadly the company that made the original Elson Coral E system no longer exists (the company/brand has disappeared, then been resurrected and then disappeared, at the time of writing this April 2025, Elson as a brand is available again.
The Good news
We can supply brand new Coral E Hot Water Thermal Stores, which are now made to order based on the original tools, technology and immersion heater controls.
In order for us to quote please provide us with the following information –Capacity of existing hot water tank – this will be on the data badge of the existing Elson
Coral E, see picture. If the data badge is missing, please don’t worry, we can work out the capacity from the overall dimensions.
- Height of existing Coral E – measure top to bottom
- Width of existing Coral E – measure left side to right hand side
- Depth of existing Coral E – measure from rear of tank to front facing edge
- How many bathrooms do you have ?
Please email us some photos of you existing Elson Coral E thermal store hot water tank – hello@londonboilercompany.com
If you need a replacement Coral E System please contact us on 0208 829 8244
A brand New Elson Coral E Thermal Store comes complete with an Exclusive Lifetime Tank Warranty and 2 year parts and labour warranty, excludes lime-scale damage Common Elson issues and problems, this applies to the whole range Intermittent Hot Water or some hot water which then turns into cold water Without an engineer physically attending and testing the actual Elson thermal store often called the hot water boiler, this indicates issues with the immersion heaters/thermostats – engineer visit required My Elson boiler is leaking ? …..and I have not touched it
Leak Warning –
All Elson Tanks WILL leak at some point as they are lined with 1.2mm copper, London’s hard water corrodes the copper lining and they leak, they are most likely to leak when the immersion heaters are changed, the thin copper internal wall will have a lime-scale film which breaks and tears when the immersion is turned, thus causing leak.
The brass immersion heater thread which screws into the body of the Elson hot water tank is the common place for the leak to occur.
Naughty Naughty
We have also seen the overflow connection to the Elson capped off and a ‘fake’ copper overflow/discharge pipe placed behind the Elson, but the overflow pipe is NOT connected to anything, it’s there to deceive the building inspector (this happens in new build properties built in the last 20 years.
You only know the ball-valve aka float valve is faulty when your flat is being flooded by leaking water
See our video below for the best replacement and most reliable solution
Elson Coral E Thermal Store – picture of data badge which contains all the information we require
If your Elson Hot Water Tank is leaking, here is a short video explaining the best solution for cost effective replacement.
Want to change or replace your Elson Thermal Store?
Thermal Store vs Mains Pressure Unvented Hot Water Cylinder
Here are some Solutions
Elson Coral E Hot Water Tank Broken and Leaking ? How to Repair or Replace by BBC Expert Ian Puddick
Why Do Elson Thermal Stores Leak ??
Elson Si Thermal Store supplied via District Heating – what is the best solution
Why Elson Hot Water Tanks leak and flood properties – Watch this and how to check
Replacing a Elson Coral E Hot Water Tank in Central London 2023