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In this article I present the Honeywell HR25 Energy electronic radiator thermostat. The article is part of the series “Electronic radiator thermostats in test”, in which I review and evaluate programmable radiator thermostats from various manufacturers.
Top 5 Electronic Radiator Thermostats
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Table of Contents
The main features and technical data
Before we go into details like scope of delivery, installation and the actual review, I have summarized the most important features as well as technical details of the Honeywell HR25 Energy in a table for you:
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Scope of delivery
After unpacking the Honeywell HR25 Energy, I immediately notice the beautiful and revised design to the previous model HR20 Rondostat. The Honeywell HR25 Energy consists of two parts: the radiator thermostat and a valve attachment, which fits all common radiator valves with the factory standard M30 x 1.5.
The scope of delivery also includes an adapter set for the Danfoss valves RA, RAV and RAVL as well as an instruction manual. In the assembly instructions for the adapter set you will find all the important information for attaching the Danfoss adapters.
Unfortunately, the Honeywell HR25 Energy does not come with batteries, which is not understandable considering the comparatively higher price level. It is necessary to order a pack of AA batteries* in addition to the thermostat.
I cannot recommend rechargeable AA batteries for programmable thermostats. Firstly, the self-discharge of rechargeable batteries is usually much higher than for regular batteries, so that the rechargeable batteries, which are supposed to supply the thermostat heads with energy over a relatively long period of time, usually run out before the end of the heating period. On the other hand, many rechargeable batteries have a very low nominal voltage of only 1.2V. As a result, batteries are often still very well charged, but do not reach the necessary voltage level to operate the devices.
Installing the radiator thermostat
The installation for the HR25 was comparatively simple. In the first step, the old thermostat is dismantled from the radiator valve and the supplied valve attachment is turned onto the valve. Here, similar to the Honeywell HR20 Rondostat, care must be taken to ensure that the straight terminating side points horizontally upwards (see Figure 3.4).
In the second step, insert the AA batteries into the thermostat and place the thermostat on the valve attachment. After the successful snap-in, the HR25 Energy is ready for operation and can be programmed after the automatic adjustment.
Programming
After self-adjustment of the thermostat, the date and time are set and the heating times can be stored in the thermostat. From my point of view, programming the HR25 Energy was quite intuitive. However, since I also tested the Honeywell HR20 Rondostat and HR30 Comfort+ thermostats, my view may be somewhat clouded by this. So it is definitely recommended taking a look at the user manual of the Honeywell HR25 Energy.
With the HR25 Energy it is possible to set up to 6 switching times (3 heating times) for each day of the week. This is done via the programming button and the dial on the thermostat. Furthermore, you can switch between AUTO, ECO and manual mode during heating operation. In ECO mode (economy mode), the currently set temperature is reduced by 3 Kelvin. Special program parameters such as switching from summer to winter time, optimization function, valve position or sensitivity of “window open detection” can also be set as required.
The HR25 Energy has the following time program preset at the factory:
- Heating time from 6:00 – 22:00
- Saving time from 22:00 – 6:00.
However, in my view, the times should be individualized to get the optimal energy saving potential out of the HR25 Energy.
Usability
In contrast to the previous model Honeywell HR20 Rondostat, the HR25 Energy has a larger display, which makes it much easier to read and set the parameters during programming and operation. In my view, this is very positive and an important innovation. Only the following model, the HR30 Comfort+, performs even better with an illuminated display.
After the Honeywell HR25 Energy has been programmed and the desired settings have been entered, the room temperatures can be adjusted via the dial as required, just like with a conventional thermostat. One way to save energy is to use the ECO mode, which can be activated at the touch of a button. In my opinion, the HR25 is very easy to use.
Control behavior
I found the control behavior of the Honeywell HR25 Energy to be good. It ensures a constant room temperature and works very reliably. The “window open detection” of the HR25 ensures automatic closing of the thermostat and thus prevents unnecessary heat consumption. The sensitivity of the “window open detection” can be set during programming. However, this is limited only to “sensitive” and “less sensitive”, with the default setting of the thermostat set to “sensitive”.
Despite the “sensitive” setting, after several tests I have to say that, as with almost all tested programmable thermostats, the “window open function” is not quite mature. The response time of the Honeywell HR25 Energy to a cold air drop was about 2 – 4 minutes during a shock ventilation. This reaction time is clearly too long during the cold season, when a shock ventilation should not last longer than 3 – 5 minutes.
Tip: If you want to save on ventilation, you should turn the thermostat manually to a low temperature during shock ventilation and then switch back to automatic mode.
Conclusion
The design leaves hardly anything to be desired and the technology is first-class. Anyone who values a good-looking programmable radiator thermostat with many functions should strike here. More functions and a more exclusive design can only be found in the Honeywell HR30 Comfort+.
Rating: Honeywell HR25 Energy
Summary
ADVANTAGES: Technology, design, installation/operation, optimization function.
DISADVANTAGES: Delivery without batteries, window open function, price
Go to shop*
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I hope I could provide you with valuable information with this review and help you with your purchase decision. If you have any questions, suggestions or criticism, please use the comment function.
Many greetings! Martin
Further links and sources:
Manual Honeywell HR25 Energy
