Contour is partnering with Danfoss for its updated range of thermostatic radiator valve kits, and from mid-September 2026 every new specification will be supplied with Danfoss valves.
The change gives customers a choice between a standard pre-settable TRV kit and a Danfoss Dynamic Valve option for compatible two-pipe heating systems. It also brings Danfoss heating-control technology and technical support to every LST radiator we supply. If you have a live order or an existing quotation that names Hertz valves, nothing changes: those will be supplied with Hertz valves as quoted, unless you ask us to switch.
Most LST radiator projects need a dependable pre-settable TRV kit that installs cleanly and stays serviceable for years. A growing number, particularly larger two-pipe systems and buildings moving to heat pumps, benefit from a valve that does more. Danfoss lets us offer both from one range, with one set of documentation and one point of technical support.
The difference is noticeable. A standard valve controls the temperature of one room. The Danfoss Dynamic Valve (RA-DV) does that too, and it also helps the radiator take its fair share of hot water as conditions elsewhere in the system change. The extra cost buys more consistent comfort, potentially less wasted energy, and less balancing fuss over the life of the system.
In addition to being a superior product, Danfoss also brings selection tools, application guidance and product data that we can pass straight through to consultants and installers
Danfoss is pleased to announce its collaboration with Contour Heating Services, supplying innovative energy-saving Dynamic Thermostatic Radiator Valves alongside our advanced range of energy-saving gas sensors.
This strategic collaboration brings together the expertise and capabilities of two established market leaders, aligned in their commitment to delivering innovative, energy-efficient solutions that support customers in reducing energy consumption, improving operational efficiency, and achieving their sustainability objectives.
By combining our complementary technologies and expertise, Danfoss and Contour Heating Services are positioned to provide a comprehensive solution designed to deliver measurable energy savings while supporting the transition towards more efficient and sustainable heating environments
Ian Hill, Area Sales Manager Midlands, Danfoss
"Contour Heating is delighted to be offering Danfoss TRV kits with our LST radiators.
"We are always striving for ways to improve our products for customers and the public sector as a whole. Danfoss' innovative design & manufacturing quality, I am sure we have found a new way to do this."
I look forward to a long and fruitful partnership"
Richard Holland, National Sales Manager, Contour Heating
Two customer options for each type of TRV fitting
Standard Danfoss pre-settable kit. This is the default for most projects: a Danfoss pre-settable TRV body, a thermostatic head with remote sensor options where the casing calls for it, and a matching lockshield. It suits schools, wards, care homes and secure units where the priority is reliable room control, straightforward commissioning and easy replacement of parts over time.
Dynamic Valve option (RA-DV). For compatible two-pipe systems, the RA-DV replaces the standard valve body and adds automatic hydronic balancing at each radiator. It takes the same RA-connection thermostatic heads as the standard kit, so remote sensor and anti-tamper options carry across. It is the practical choice for projects where balancing and system performance are priorities.
In short, the updated range gives customers a choice of standard and dynamically balanced valve kits, Danfoss heating-control technology with technical support behind it, and a clear route for projects where system performance is part of the brief.
How the Dynamic Valve works
The RA-DV combines thermostatic radiator control with a built-in differential-pressure controller in one valve body.
At installation, the installer presets the calculated maximum flow for that radiator directly on the valve. That figure comes from the heat loss and design flow rate in the M&E design, so the valve is set to what the room needs rather than a rough estimate.
Once set, the valve helps maintain that flow as conditions elsewhere in the system change. When other TRVs close down on a mild afternoon, or a variable-speed pump ramps up and down, the differential pressure across each radiator shifts. A standard valve passes more or less water as a result. The RA-DV compensates, so the radiator keeps receiving roughly the flow it was set for, within the valve's stated operating range. Watch below for more information.
This makes accurate radiator balancing simpler: fewer overheated rooms near the pump, fewer cold rooms at the end of the index run, and less time adjusting lockshields after handover. It supports consistent room temperatures and efficient system operation, and on heat pump systems, where stable flow and low return temperatures protect efficiency, that has a direct bearing on running cost.
A few more details regarding the changeover
- Changeover date: Danfoss kits apply to all new specifications from mid-September 2026
- Existing specifications and quotations: Where Hertz valves are specified, you will receive Hertz valves. If you would prefer to move to Danfoss, tell us and we will confirm the substitution in writing.
- Live orders: Fulfilled as quoted. No action needed.
- Replacements and adapters: No change. Existing LST radiators, tail connections and adapter arrangements are unaffected.
- Documentation: Danfoss data sheets and installation guides are available for each kit, co-branded so they file with the radiator paperwork.
- Technical contact: Richard Holland, National Sales Manager, on +44 (0) 7496 458744 or richard.holland@contourheating.co.uk.
If you are unsure which valve a project should carry, send us the room schedule and M&E drawings and we will mark up a recommendation.
More choice, better support
Contour customers now have two clear routes: a standard Danfoss pre-settable kit for everyday LST radiator projects, and the RA-DV Dynamic Valve for compatible two-pipe systems where balancing and energy performance matter.
You can compare the options on our TRV valve kit page. If you would like help deciding which kit is right for your project, contact the Contour team on +44 (0) 1952 290498 or email sales@contourheating.co.uk.
The valve is a small part of a radiator installation, chosen correctly, it is the part that decides whether the system performs optimally.