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Hi Folks

I'm used to (and understand reasonably well) simple dual tariff arrangements with two main switches (either two separate consumer units or a duplex). But I occasionally come across, and am now quoting for changing consumer units for a more complex arrangement that I don't full understand. There are four main switches, one for regular 24 hour loads (light, sockets, etc.), one for 24 hour heating, one for off-peak space heating, and one for off-peak water heating. I've seen this type of arrangement in a single duplex consumer unit, four separate consumer units, or two consumer units (one with all heating loads, one with just the 24 hour non-heating loads). So my questions are:

1. Why are the 24 hour heating and non-heating loads separate?

2. Why is the off-peak water heating load separate from the off-peak space-heating loads?

3. Is there any reason not to combine the loads onto two main switches, one with all 24 hour loads and one with all off-peak loads?

P.S. I can't remember the exact setup with the meters, but as far as I can remember, there were separate live tails to each main switch, each fed from different meter terminals, i.e. none of the main switches were fed from the same live meter terminals via a Henley block.
 
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