as far as i know you just have to have access to them all.....as in make sure you can walk between your tank and the furnace...make sure that you have enough room around the water meter so that it ever had to be replaced the tank wouldn't be in the way...
So in other words I would say 1 metre away from the furnace and water meter
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500G Mixed Reef
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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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