Compatible with Horstmann ChannelPlus H27XL series: Ensures perfect integration with your existing heating system.

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! We are unable to deliver to the Isle of Scilly, Jersey, Guernsey, Northern Ireland, Isle of Man and the rest of Europe.

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.

This means you don't have to disconnect and reconnect any of the wires coming into the back part, which is really only a terminal board. 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. For example they mention it's easy to install and program, has great features, and fits to the exact same back plate. This product has now been replaced by the: Horstmann (Secure) 2 Channel Receiver Smart Programmable Thermostat (C1727).Every time there was a power cut, the battery no longer held the times I had set so I had to manually re-set them, a tedious process. We're sorry but this product has now been discontinued by Horstmann Controls and can no longer be purchased. 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. due to a plumbing issue we now have to wire a second boiler alongside another in a reasonable size house.

As it was a like-for-like replacement, you only need to replace the front part which contains all the electronics, which simply slots into where the original detached. 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.li>Advance and override functions: Easily adjust your heating without affecting the programmed settings. You can change your choices at any time by visiting Cookie preferences, as described in the Cookie notice. 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.

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. 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.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. Registered address: National Shower Spares Ltd, Units 16-17 Bamel Way, Gloucester Business Park, Brockworth, Gloucester, Gloucestershire, GL3 4BH. But after speaking to Horstmann because there was no wiring diagram in the box they informed I needed to use all the terminals.