Switchmaster 805 replacement

[Hev166]

I would really appreciate some help. I am looking to replace my switchmaster 805 which doesn't work. The central heating has to be on constantly to get hot water. The timer doesn't work either.

I have read many posts but found nothing conclusive about which is the best up to date replacement.

Any advice would be appreciated, many thanks

 

[doitall]

Almost any programmer you like.

The old 4 goes to 1 hw off

The old 3 goes to 3 hw on.

The old 1 goes to 4 htg on.

2 is not used.

L & N are the same.