Advice on Radiator Thermostats

Some radiators in your home take significantly longer to heat up than others. There’s a chance that your radiators require balance. This article will lead you through balancing a radiator and restoring equilibrium to the heating system of your house. 

What is a radiator thermostat?

A radiator thermostat may control the temperature directly on the thermostat. Thermostatic Radiator Valves are responsible for controlling the room air temperature. It automatically modifies the amount of hot water entering the connected radiator. Thus, it becomes more manageable and cost-effective to create a warm environment. This benefit allows you to save up to 15% on your heating expenditures. 

How does a TRV function? 

The TRV is an auto-regulating valve that alters the flow of hot water into a radiator. The head sits atop the body; when the ambient temperature fluctuates, a capsule in the valve head contracts or expands, forcing a pin in the valve body to move and open or close the valve. 

If the room becomes too heated, the capsule will expand, causing the pin to seal the valve and reduce the flow of hot water into the radiator. Similarly, if the ambient temperature lowers, the capsule in the valve head contracts, pulling the pin out and enabling hot water to enter the radiator. 

Wax and liquid are the two most common substances utilized in TRV capsules. In general, liquid models are regarded as superior, and their price reflects this. One of their benefits is their sensitivity to variations in temperature; although the wax capsule responds slowly to expansion and contraction, the liquid capsule alters the flow of water into the radiator considerably more rapidly. 

Functions of Thermostat

The following are the primary functions of the engine thermostat: 

  • A thermostat’s primary function is to regulate the engine’s operating temperature.

  • Overheating and excessive cooling are prevented by thermostat components.

  • During a cold start, the thermostat inhibits the flow of coolant. This allows the engine to reach operating temperature faster.

  • It ensures that coolant absorbs heat before entering the radiator and controls coolant flow throughout the engine.

  • Wax, a rod, a cylinder, and a valve make up the thermostat. At some time during the operation, the features of these sections will be specific.

Working Principle

To most novices in the automotive sector, the operation of a thermostat may seem mystical. However, this reality is less complicated and straightforward to comprehend. As noted previously, the components are situated between the engine and the radiator in the internal components. Therefore, coolant from the radiator flows down its downpipe to the engine. It is where heat absorption occurs. 

However, the engine must also operate at a specified temperature. Imagine a motor without a thermostat, where coolant would flow to absorb the heat it generates. Due to the heat absorbed by the coolant from the combustion process, the vehicle may fail to operate. If a thermostat is present, however, the flow of the coolant is prevented until the coolant reaches a certain temperature, at which point the device must open. This engine will operate at the correct temperature and not overheat or be undercool. 

Examining a Thermostat 

A radiator thermostat can be tested without removing the component to be checked. The engine computer monitors the thermostat in modern cars (PCM). The warning light will activate if it becomes stuck open or closed.

Most mechanics test the thermostat by monitoring the temperature of the top and bottom radiator hoses. It is possible using an infrared thermometer, which aids in monitoring the engine’s temperature. 

A thermostat is an important component of a cooling system. The major role is to regulate the coolant flow to maintain the optimal engine temperature. Coolant flow is halted until the thermostat reaches the temperature set by the user. If it becomes stuck open or closed, it may malfunction.


Without the Smart Radiator Thermostats, all radiators need to be controlled manually. If the typical radiator thermostats are left open, the radiators will heat anytime the boiler is on. Traditional thermostats should be set to frost protection mode, and the temperature should only be increased when the room is occupied.

If you wish to alter this behavior, we recommend equipping your radiators with tado° Smart Radiator Thermostats* to achieve room-specific temperature management. We would gladly provide personalized guidance on how tado° regulates and optimizes your heating system. 

Please chat with us and tell us about your heating configuration.

If your heating system doesn’t have a bypass valve, you might need to install one (differential pressure regulator). It guarantees that your heating system’s pump pressure and flow rate remain consistent. If necessary, we recommend having this fitted by a skilled professional. 

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