Better heat transfer
Designed to reduce the surface tension of system water so it contacts heated surfaces more effectively.
Max Energy 24/7 × EndoTherm
Make the water in your heating system work harder.
EndoTherm is a specialist additive for suitable wet heating systems. Max assesses the property, arranges treatment and records the evidence, without asking you to decode the chemistry.
What it does
A small intervention with a measurable job.
The additive changes how system water transfers heat across boiler or heat-pump exchangers, pipework and emitters. It is introduced into the closed circuit after suitability checks.
System-wide use
Suitable for many water-based radiator and underfloor circuits, including boiler and heat-pump systems.
Survey and record
Max checks compatibility, records dosing and keeps the treatment within the wider building evidence trail.
The Max delivery route
Check. Treat. Evidence. Review.
Confirm a compatible wet heating circuit and identify existing chemicals
Establish a usage baseline before treatment wherever data permits
Dose through an appropriate access point with minimal disruption
Record product, quantity, date and commissioning evidence
Review performance against weather, occupancy and tariff context
Could it be fully funded?
Potentially zero upfront client cost may be available through an applicable Max-arranged programme. Availability is subject to survey, scheme rules, customer and property eligibility, approval and terms. Funded does not mean universally free.
Check the funding routeEvidence and limits · reviewed 30 September 2026
“Up to 15%” is not a promise for every building.
EndoTherm reports laboratory testing by Enertek International and verification through the Energy Saving Trust. Real outcomes depend on system condition, controls, temperatures, occupancy, weather and the quality of the baseline. The product is for suitable wet heating systems, not direct electric heating.
Manufacturer information Energy Saving Trust
Official EndoTherm logo use remains subject to partner brand approval; this page uses a restrained text lock-up meanwhile.