I was wrong, one tank overflow (c/w) is actually piped into the other tank (c/h) and then just one pipe from that to the outside. Does this change anything, if not can you tell me why they should be separate.
it definitely changes things, each ballvalve if faulty will overflow causing the tank to fill and overflow through their own pipe, theoretically before the tank overfills and damages the property, if one runs into the other and they both overflow at the same time (unlikely but possible) then the overflow pipe would probably not take the volume and you would have a flood, also i wouldn't be too happy with heating and domestic water being connected at all just in case they mixed(prob unlikely) but again the best design is to keep them apart so there is no chance as opposed to little chance.
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