ESI - Energy Saving Innovation Controls ESCTDEB ESI Controls Electronic Dual Cylinder Thermostat, White

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My stat's broken right? Is there any other reason why it would behave like I described? The cylinder is in a cold loft so could the low external temperature affect the reading of the stat?

If the Legionellasetting is active on the ESCTDE/B, the unit will automatically switch 230v to the Domestic Hot Water motorised valve (NOTE- this overrides any programmer settings), which in turn will bring on the heating, the output from the ESCTDE/B will remain on for 1 hour when the tank temperature is above 61℃. The large dial makes it easy to set the required controller temperature (between 25°C and 65°C), whilst the second (limit) thermostat is pre-set to 80°C with a concealed manual reset, to comply with building regulations.

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Making the decision on the right kind of Heating Control is a key decision. Once you decide that Cylinder Thermostats give the best solution then the ESi Electronic Dual Cylinder Thermostat - ESCTDEB is clearly worth considering. Users want to know the temperature of the water going to the taps, but because the cylinder thermostat is much lower down, they are derated to take into account the temperature that they are measuring much lower down will be less. But because it's a moving goal post and even hot water cylinders vary due to their size the thermostats are rarely right. In my experience, the 10C difference you refer to actually about par for the course.

Wiring was quite straight forward as per diagram.Remember you will need 5 core cable if changing from old 3 core ,like myself. Pay a sparky if you aren't clued up how to fit. When I bought the electronic thermostat, I assumed that, when the schedule for hot water was active, the ESCTDE/B was clever enough to automatically increase the demand temperature from the set point for the required duration when the day timer had counted down. The ESi Controls Electronic Dual Cylinder Thermostat* is a revolutionary new energy saving product, developed exclusively by ESi Controls. The Hot Water can be stored at any desired temperature between 25deg;C and 65deg;C, with the confidence that the weekly automatic one hour 'boost' to above 60deg;C kills any legionella bacteria, resulting in substantial energy saving. This cookie, set by YouTube, registers a unique ID to store data on what videos from YouTube the user has seen.Are you suggesting that I should just make peace that the stat is sh*t, and use it as if the dial had no numbers on it?

NOTE – The mains supply to the ESCTBE/B MUST be from the same source as the heating systems programmer, this will ensure that there is only one point of electrical isolation for safe working.The ESi Controls electronic dual cylinder thermostat is a revolutionary new energy-saving product, developed exclusively by ESi Controls and designed for greater accuracy, more effective operation and a real homeowner safety benefit.