Reduce heating energy consumption and carbon emissions NOW!

EndoTherm is an easy to install, award winning, energy saving additive suitable for any wet heating system that is proven to save up to 15%

Large library of customer verified pilot studies

Suitable for Domestic and Commercial Heating Systems

EndoTherm – Energy Saving and Carbon Emission Reducing Heating System Additive

EndoTherm is a unique, multi-award winning energy saving additive independently proven to save up to 15% on space heating energy consumption.

Scalable to work in any small or large wet heating system,
EndoTherm delivers savings for both domestic and commmercial users.

Systems Heat Up Quicker…

Improved Heat Transfer…

Using Less Energy!


Independently Proven

EndoTherm has been rigorously tested with savings confirmed by multiple third party Research & Development laboratories and facilities.


Easy to Install

EndoTherm requires no system downtime and can be installed, like an inhibitor, in just 10-15 minutes.


Non - Corrosive

EndoTherm is non-corrosive to heating system components in use and is non-hazardous with no discharge requirements.

Award Winning & Recognised

EndoTherm is a multi-award winning technology with confirmed compatibility with leading boiler and inhibitor brands.

Carbon Emission Reduction

As EndoTherm reduces heating energy consumption, greenhouse gas emissions are also reduced which is vital to achieve net zero targets.


100% Organic

EndoTherm is made from 100% organic materials and is responsible for 0.58Kg embodied carbon which is offset in under a day of use.

The Power of EndoTherm
Demonstrated by Customer
Verified Pilot Schemes and Case Studies

We have a large portfolio of case studies across a broad spectrum of installations.

Click the buttons below to see some headline savings for both commercial and domestic EndoTherm installations.

In partnership with:

CIBSE - Energy Saving Product of the Year 2016
CIBSE - Energy Saving Product of the Year 2016
H&V News Awards 2015 - Domestic H&V Product of the year
Ecobuild M&S Big Innovation Pitch Winner

EndoTherm works in conjunction with corrosion inhibitor products, with confirmed compatibility from leading inhibitor brands like…

Adey Inhibitor Brand Fernox Inhibitor Brand Sentinel Inhibitor Brand

EndoTherm central heating additive also available at Nigels Eco Store
Energy crisis to plunge even more households into fuel poverty

Energy crisis to plunge even more households into fuel poverty

The global prices for gas are rising at an unprecedented rate due to a number of factors. The restarting of global economies post covid-19 lockdowns driving high demand, calm UK weather over the summer months producing less renewable wind power and reduced access to...

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EndoTherm Shortlisted for Energy Awards 2021

EndoTherm Shortlisted for Energy Awards 2021

  In a welcome return to the celebration of achievement, The Energy Awards 2021 are set to go ahead at the Grosvenor House, London on 22nd September 2021. The awards are set to resume its history of celebrating innovation, best practice, and business excellence...

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EndoTherm Double Finalist in The Energy Awards 2018

EndoTherm Double Finalist in The Energy Awards 2018

  Returning for 2018, The Energy Awards, takes place at London Hilton on Park Lane on 5th December and EndoTherm has been confirmed as a finalist in two prestigious categories. A proud achievement sees EndoTherm shortlisted in Energy Efficient Partnership of the...

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It is very clear that tangible action has to be taken immediately to tackle climate emergency, achieve net zero carbon goals, and combat rapidly rising energy costs that are sadly forcing even more households into fuel poverty.

EndoTherm presents an extremely attractive, low cost opportunity, to quickly reduce space heating energy usage by double digit figures.

Our team is on hand and ready to help you.

EndoTherm Carbon Reduction Energy Savings

How EndoTherm Works

EndoTherm is a unique energy saving central heating additive, independently proven to save up to 15% on heating bills! But how does it work?