Why You Need a Thermostat for Your Heater and How to Choose One

A heater without a thermostat either overheats the room or wastes electricity once the room is already warm. The difference in costs between regulated and unregulated heating is noticeable already within the first month. In this article we'll look at the types of thermostats, how they work, and what to look for when choosing one.

What is a thermostat and how does it work?

A thermostat constantly compares the set temperature with the actual room temperature. When the temperature drops below the set threshold, the device powers the heater; once the target value is reached, it switches it off. This cycle is called hysteresis, and the smaller its range (for example, 0.5°C instead of 2-3°C in cheap models), the more stable the microclimate and the fewer unnecessary on/off cycles, which shorten the life of the heating element.

Mechanical or electronic: what's the difference?

Mechanical thermostats

Easy to install, durable, and unaffected by voltage fluctuations. The downside is low measurement accuracy and no flexible settings for the household's schedule.

Electronic and Wi-Fi thermostats

They measure temperature precisely, allow different day and night modes to be programmed, and Wi-Fi models let you control heating remotely. This is especially handy when you need to pre-heat the house before arriving home, or lower the temperature while you're away.

Why do you need a separate thermostat if the heater already has a power regulator?

A built-in power regulator only limits the heating element's output level, but doesn't automatically maintain a precise room temperature. A separate thermostat works off an air temperature sensor and decides on its own when to switch the unit on and off — that's the real source of savings, not just manually turning power down. Read more about balancing the load across several appliances in the article how to reduce the load on your electrical network.

What does experience with Wi-Fi thermostats show?

Based on observations of customers who installed a Wi-Fi thermostat in a 15-20 m² room, a typical scenario is a daytime temperature of 20-21°C, a nighttime drop to 17-18°C, and a full shutoff while away from home. This gives a real reduction in heater running time of 30-40% compared to holding 21°C around the clock. Whether it's cheaper to run continuously or intermittently is covered in detail in the article which is cheaper: continuous or intermittent mode.

Built-in, plug-in, or universal thermostats?

• Plug-in — the simplest to install, plugged in between the heater and the outlet, suitable for any appliance up to the specified power limit.
• Built-in — mounted into the wall, require an electrician, look neater.
• Universal — can be either built in or plugged in, giving maximum flexibility when moving or replacing the heater.

For most apartments and houses, a universal model is more convenient since it doesn't tie you to one installation method. A thermostat can be paired with a control unit with a heating element if you have a water radiator, or connected directly to a ceramic panel.

What to look for when choosing?

The thermostat's maximum connected load should exceed your heater's power — a standard margin for household models is 2.5-3 kW. Check whether your smartphone's operating system is supported (Android/iOS), whether the mobile app is available in a language you understand, and whether several thermostats can be linked to one account to control the whole house from a single place.

Sources and useful links

Electrical safety requirements for household thermostats are set by the general standard DBN V.2.5-67:2013 (electrical equipment of residential buildings). See the range and specifications of the thermostats themselves in the ECOTEPLO accessories section.

A thermostat isn't a "nice-to-have" option — it's a tool that pays for itself within one or two heating seasons through direct electricity savings. If you're still using a heater without automation, this is the first and cheapest upgrade worth making.