EndoTherm – Energy Saving Hydronic Heating Additive

EndoTherm is a unique, energy & fuel saving hydronic heating additive independently proven to save up to 15% on energy consumption.

EndoTherm is:


Independently Proven

Savings of up to 15% proven by a leading R&D laboratory.


Easy to Install

EndoTherm can be installed  in just 10-15 minutes.


Non - Corrosive

EndoTherm is non-corrosive and has slight inhibitor properties.


100% Organic

EndoTherm is made from 100% organic materials.



EndoTherm is suitable for any hydronic heating system.


Available worldwide!

Contact us to get EndoTherm in your location.

EndoTherm is verfied by The Energy Saving Trust
EndoTherm Awards
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

“The process of installing EndoTherm went smoothly with no interruption to the normal function of our building. Our goal is to save on energy costs and reduce our carbon footprint as much as we can. Thanks again for helping us reach a 12.5% savings on our natural gas usage!”

– Jayson Troupe, Facilities Manager. Borough of Lansdale.



“Rhondda Cynon Taf County Borough Council have tried a few test cases looking at EndoTherm. We added EndoTherm into a variety of buildings with no other changes. We have discovered that radiators reported as hotter (from people unaware of what we have done) and a reduction in consumption between 12-21%.”

– Jon Arroyo, Energy Manager. Rhondda Cynon Taf County Borough Council.

“One of the many reasons we decided to use EndoTherm was the zero retrofit costs. We simply installed EndoTherm directly into your system and the savings began to accrue. The University saved $30,000 and only spent $7,000 over the pilot period due to Gehrke Technology Groups monthly financing plan. NEIU also saved 300,000lbs of CO2e. It’s pretty good that you put something in, then you get results and so quickly too.”

John Murray Chief Engineer, Northeastern Illinois University

“EndoTherm was installed into our Abbotsford and Chilliwack campus buildings in early 2018. As a result, we’ve seen a significant reduction in our natural gas consumption and associated carbon emissions. We’re pleased with our expected 18 month return on investment.”

Blair McFarlane Energy Manager, Facilities and Project Management, University of the Fraser Valley



“The (EndoTherm) project certainly hasn’t disappointed, installation was extremely simple and savings have by far exceeded our initial expectations. The installation at Lingley Mere has been a huge success and is continuing to realise savings month on month.”

– Stephen Vaughan, Energy Manager. EMCOR UK.

“We are now working with the winning product, EndoTherm”

– Munish Datta, Head of Plan A and Facilities Management (M&S)

‘The Trials with EndoTherm in our boilers have been very impressive. We have noted less circulating noise and better conductivity. We will install EndoTherm into any heating systems we install in the future.’

Heating Engineer

‘EndoTherm was installed into one of our properties and within days the boiler had to be turned down to compensate for increased performance. Overall consumption had been reduced by 15.6%.’

Director, Health Care Group

EndoTherm has confirmed compatibility with these major boiler manufacturers:

*EndoTherm does not invalidate the warranties of these boiler manufacturers

EndoTherm is featured in the October 2021 issue of the International Journal of Energy Management:

EndoTherm is a recognised technology supported by HVAC rebates in a number of territories:

HVAC Control

EndoTherm Supported by HVAC Control Rebates

EndoTherm is now supported by HVAC control rebate schemes.


Find out more about how you can take advantage…


How EndoTherm Works

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

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EndoTherm takes third place at National Energy Efficiency Awards

The leading lights of the energy efficiency industry came together on Friday 18th February 2022 at the Hilton Birmingham Metropole to celebrate the accomplishments achieved by the sector over the...

International Journal of Energy Management features EndoTherm

EndoTherm is featured in the latest issue of the International Journal of Energy Management (Volume 3, Issue 5, 2021) which is published by the Association of Energy Engineers (AEE)....

Aboriginal Housing Management Association Published Case Study

Who are AHMA? AHMA is an umbrella organization composed of 41 Members that are each Indigenous Housing and Service providers. Our members represent over 5000 Indigenous families living...

EndoTherm is a pre-approved technology under the REC program provided by the MCCAC in Alberta

Who are the MCCAC? The Municipal Climate Change Action Centre (MCCAC) was founded in 2009 as a collaborative initiative of the Alberta Urban Municipalities Association, Rural...

EndoTherm Hydronic Additive Featured in Engineered Systems

The success of EndoTherm seen by Burnaby School District was featured in Engineered Systems Magazine