Electronic trv 8 up to 28 c homexpert by honeywell rondostat hr20 style
The hr20 style is a time controlled heating regulator like the hr 20 quick and simple to install and also easy to program the hr20 style is further developed in its look the rotary knob for manual operation now forms an optical unit with the casing and also has the same colour another innovation is the new display the data can now be read easily from any angle but its internal values are totally that of an energy saver save up to 30 with the hr20 style