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Radiator Valves

A radiator valve works by regulating the flow of water in a radiator it's installed on to adjust the temperature of a room to a setpoint temperature. By fitting radiator valves in your home you can regulate the temperature based on how each area of your home is occupied and used, thereby saving on your energy bill without affecting your comfort.

What is a radiator valve?

A radiator valve is installed on a thermostatic radiator valve between the radiator and the pipe that supplies hot water from the boiler. This component measures the temperature in a room and adjusts the flow of hot water into the radiator to stabilise the ambient temperature at the setpoint temperature. The goal is to achieve a pleasant and consistent warmth in a room.

When the temperature falls (after opening a door or window for example), the thermosensitive sensor increases the flow of hot water into the radiator, and when the temperature rises (if a room is exposed to the sun for example) the flow is reduced to prevent the room from overheating. Whether they're programmable or not, radiator valves usually provide a setpoint temperature of at least 5 to 23°C, and sometimes a wider adjustment range.

The range of dedicated heating adjustment accessories available include several models of radiator valves: mechanical valves that allow you to adjust the setpoint temperature using a graduated knob marked from 0 to 5 (or in degrees), electronic valves that you can program to come on at different times of the day and allow you to adjust the temperature to the nearest half-degree, and smart radiator valves, which you can control remotely and are more intuitive to use.

Why is it beneficial to adjust the temperature room by room?

According to the French environment and energy conservation agency, domestic heating should provide a temperature of 19°C during the winter, with each additional degree increasing energy consumption by 7%. However, you don't need to constantly maintain this temperature in every room. By fitting radiator valves you can regulate the heating in each room and avoid heating unoccupied areas.

Installing a valve on each radiator in each room allows you to maintain a setpoint temperature that's suitable for each area. If your radiator valve is programmable you can even define a heating schedule that takes into account the times when each room is used.

In the living areas it's important to maintain the ambient temperature at 19-20° for optimal comfort, while you can make do with 16 to 17°C in bedrooms and 17°C in corridors and the hall, and it isn't necessary to heat to more than 15°C in an unused room. However, it's important to maintain 18 to 20°C in a baby's bedroom to make sure it doesn't get cold, while 20 to 22°C is very nice in the bathroom for when you get out of the shower!

Radiator valves have settings that are suitable for all these scenarios and even have a frost protection position marked * for maintaining a temperature of at least 6°C in your home if you're away for longer. This stops your home from getting too cold and stops the water freezing in the plumbing during extremely cold weather. Discover all our products

Why should I buy a smart radiator valve?

Smart radiator valves are more expensive than manual or electronic valves. Nevertheless, this price difference is justified by the extra features and the fact you can make significant energy savings.
Comfort is optimised thanks to easy adjustments:
  • Adjust the setpoint temperature to the nearest half-degree
  • Control the radiator valve remotely using a smartphone app
  • Manually adjust the setpoint temperature by turning the knob
  • Create programmed heating schedules based on your habits
  • Manage unexpected events (change in working hours, unplanned occupancy of a room, etc.)
  • A smart radiator valve takes its environment into account (sunshine, open window, etc.)
  • Netatmo smart radiator valves work with voice assistants from Amazon, Apple and Google

Smart radiator valves: regulation and energy savings

It's well worth fitting radiator valves in your heating system to limit your energy consumption and make savings on your heating bill.
  • European regulation on individual heating costs
Since March 2017, multi-occupancy buildings with district heating must individually break down each home's consumption so that everyone pays the cost of their actual consumption, rather than a share of all occupants' consumption as was previously the case. This measure is designed to make co-owners or tenants more accountable to encourage them to moderate their energy consumption.
This means that each home needs to be fitted with heating dispatchers. To moderate your consumption as much as possible without affecting your comfort, it's well worth fitting radiator valves.
  • Radiator valves and energy savings
By optimising the temperature in each room depending on whether it's occupied and the time of day, not only can you prevent variations in warmth and unnecessary overheating, you can also cut your energy consumption and the cost of your heating bill. Each radiator valve that's fitted therefore helps to make energy savings.
The simplest, non-programmable radiator valves already allow you to optimise the use of heating by adjusting the temperature of a room. Programmable radiator valves also allow you to program your radiators according to the time of day or night and increase your energy savings. Meanwhile, smart products are the most effective at saving energy. It's thought that the energy savings from smart valves fitted in various rooms can be as much as 40%.
What's more, if you combine a smart thermostat to optimise the running of your boiler with radiator valves in different rooms, you can give yourself a good chance of making savings while maintaining your comfort as much as possible.

Installing a radiator valve

Fitting a radiator valve isn't particularly difficult: it's usually screwed or inserted into the main body of the valve component. You nevertheless need to check that the radiator valve is compatible with the main body of the valve component that you want to fit it to. If the valve component is accessible and there aren't any obstacles nearby that can produce an incorrect temperature reading, you can make do with a standard model that has an integrated sensor. If not, you'll need to get a model that has a separate sensor.

An electronic radiator valve is also easy to install. You'll nevertheless need to insert batteries in order to power it. Radiator valves are usually installed on the existing knob and replace the previous valve.

You don't need to be particularly good at plumbing or electronics to fit a radiator valve either. To install Netatmo products, all you need is a personal Wi-Fi network with broadband internet access and check that your heating system is compatible. Smart radiator valves come with a relay device that's installed in the centre of your home to handle communication of the long-range radio frequency elements and the link with the internet via Wi-Fi.

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