Need a boiler programmer that operates water and central heating independantly?

I currently have a boiler programmer (honeywell) that switches on the central heating and water together, I want one that can operate those independantly because we need the water on longer than the gas and I think it's costing quite a bit of money. I don't know what I'm looking for when reading... show more I currently have a boiler programmer (honeywell) that switches on the central heating and water together, I want one that can operate those independantly because we need the water on longer than the gas and I think it's costing quite a bit of money.

I don't know what I'm looking for when reading the programmer specifications, is it split channel/ duel channel? Can anyone suggest a good make / model?
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