Unfortunately, I don't know anything about the valve having never seen your particular type. But electrically speaking, the Channelplus and the Hive are just switches and are identical in their operation, so if your heating works with one, then there is no reason why it wouldn't work with the other.

I am assuming here that you are referring to a 'Secondary Hot Water Circulator' that circulates the domestic hot water around a ring main so that hot water is available instantly at each outlet, then the answer is yes you will need to move that to another timer. This is the first time I have come across this in a domestic property, but can understand why if you have an unusually long pipe run.

I'm not sure I understand what you mean by the above, because the switching elements of the Channelplus 37xl and the Heatlink work in exactly the same manner. TIME AND DATE - The programmer has been pre-set with the current time and date during manufacture. No alteration should be required to the time and date, however if any modifiaction is required please refer to the 'Adjusting Time and Date' section of the user guide.

Once the mains power has been switched on the ChannelPlus H37XL Series 2's display will illuminate. The programmer has a number of pre-programmed functions to assist the installation, which are detailed below; The programmer is fitted with a non-rechargeable, non-serviceable long life battery, which will maintain the programmed time settings with the mains supply disconnected. I'm wondering this due to the wiring indication that came with the valve, and also the number of wires in the connecting box. An Example circuit diagram is shown below. This diagrams is schematic and should be used as a guide only. The Secure Meters Horstmann CHANNELPLUS H37XL is a white 3 channel 7 day electronic digital programmer with independent timing of heating and hot water. User friendly, it is designed for domestic use, providing advanced, easily programmed features.

For reasons of space and clarity the diagrams has been simplified, for instance some Earth connections have been omitted. Other control components shown in the diagrams i.e. Valves, RoomStats etc. are general representations only. However the wiring detail can be applied to the corresponding models of most manufacturers e.g. Horstmann, Honeywell, Danfoss Randall etc. I would be tempted to try and trace it to see what it's connected to, for my own curiosity as much as anything, or disconnect it and see if anything stops working. Of course the Nest will not only switch off when the time goes off, but also switch off when the correct temperature is reached, but the wiring doesn't know that, as far as it is concerned it's just going off. Designed for use with fully pumped central heating systems, using three separate two-port zone valves.