A suitable replacement is: Horstmann (Secure) 2 Channel Receiver Smart Programmable Thermostat (C1727).

But after speaking to Horstmann because there was no wiring diagram in the box they informed I needed to use all the terminals. Just be aware that the contacts between the backplate and the programmer are very tight as supplied and it takes a forceful tug to get the unit off again once fitted (which is what stumped the builders! Fortunately as I was no longer struggling with worn-out buttons and a dead internal battery, putting in the settings I wanted was much quicker than with the old device. I’m not sure which controllers will be compatible with my system so any advice would be greatly appreciated. The 103 third parties who use cookies on this service do so for their purposes of displaying and measuring personalized ads, generating audience insights, and developing and improving products.We're sorry but this product has now been discontinued by Horstmann Controls and can no longer be purchased. In addition to controlling a heating system, the timeswitch can be used for the timed control of a security lighting system due to its 3-amp contacts. So, like others, at Horstmann we have addressed perceived shortcomings of older controls by introducing larger, more easily read screen displays, presenting .

The new timer works perfectly well, but I know I will be facing the flat battery issue again in 7 years or so. Throughout the years Horstmann have pioneered many innovative products for central heating and hot water control, including the UK’s first purpose designed central heating programmers (Potterton 411), the first time clock with a standardised, universally interchangeable back plate, and the UK’s first three channel programmer, followed later by a four channel programmer. To replace it with the new programmer was simple as the existing backplate with the wiring simply plugs into the back of the new one. Delivered as a direct replacement for a failed unit that had done marathon service, on fitting it was discovered one of the little clips for the front was broken and the unit doesn't light up when you press a button making programming difficult.The wireless CentaurPlus C17 ZW operates with the latest Horstmann HRT4-ZW wireless room thermostat and together, the two offer a highly efficient controls package ideally suited to combi boiler installations. The ChannelPlus H27XL timeswitch has a boost function for 1 or 2 hour boosts as well as an advance button to move onto the next stage in the programme.

This product has now been replaced by the: Horstmann (Secure) 2 Channel Receiver Smart Programmable Thermostat (C1727). To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Our previous model with exactly the same programming procedure the heating setting was the key control. The H27XL can be programmed with up to 3 on/off settings per day with a separate programme every day of the week.It is a very strong fit, so you need to apply a fair amount of leverage to get the old one off and need to press the new one on firmly until it has fully engaged. You can set the times to within 10 minutes for the heating and or hot water, for three periods each day of the week. One thing to watch is if you turn off the mains electric switch on the wall, say over the summer, the controller's battery is used more keeping its time setting, and eventually shortens the life of the battery. Government regulations on the installation of heating controls as detailed in Part L of the new Building Regulations, the Horstmann Controls ChannelPlus H37 XL electronic programmer provides a fully compliant solution. XL Series 2 Electronic Programmers 17 CHANNELPLUS H47XL CHANNELPLUS H37XL CHANNELPLUS H37VXL CHANNELPLUS H27ZXL CHANNELPLUS H27XL CHANNELPLUS H21XL CHANNELPLUS H17XL CHANNELPLUS H11XL Programmer with 7 day setting over four independent channels.