I got this as a replacement for an identical controller, due to the battery having run out on the previous unit. I currently have a Horstmann H27XL programmer, as shown in the attached photo, a Bermuda Baxi boiler and a hot water cylinder which is in a cupboard upstairs. A suitable replacement is: Horstmann (Secure) 2 Channel Receiver Smart Programmable Thermostat (C1727). So, like others, at Horstmann we have addressed perceived shortcomings of older controls by introducing larger, more easily read screen displays, presenting .

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. You can have these times different for each day, or can have them the same each day, which is a bit easier and takes less time to set up. 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. Hi I have a Horstmann channel plus XL ModelH27 that has failed, will this model be a direct replacement and not need any electrical alterations to the back plate. But after speaking to Horstmann because there was no wiring diagram in the box they informed I needed to use all the terminals.

Compatible with Horstmann ChannelPlus H27XL series: Ensures perfect integration with your existing heating system. Eventually I realised that the internal battery, which is non-replaceable, must be dead, because it was supposed to be able to keep its programming during power cuts. The single, two and four channel versions are voltage free as standard and use the same backplate as Horstmann's 425 and 5 Series programmers. I’m not sure which controllers will be compatible with my system so any advice would be greatly appreciated.

For example they mention it's easy to install and program, has great features, and fits to the exact same back plate. I need to replace a Horstmann Channel Plus H21XL 2 Channel Programmer, but I believe they are now discontinued. We inherited an older one of the same model which I found very difficult to use: the buttons took a very long time to react, and every time there was a tiny power cut or surge the device would lose the programming which had taken me ages to enter. Also useful are the Boost override buttons which allows y ou to bring on the heating and / or hot water for 1 or 2 hours at any time. 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 4 channel programmer follows Horstmann Controls’ AS (or Advanced Simplicity) design parameters which features an easily read, bright blue back lit LCD display . The H27XL can be programmed with up to 3 on/off settings per day with a separate programme every day of the week.