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Circuit for heat exchanger water heaters (repost)

Discuss Circuit for heat exchanger water heaters (repost) in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Luderic

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[Sorry, I'm reposting this as my thread has been lost due to the URL change]

Hi, in a small guesthouse I have 6 water heaters with built-in heat exchanger connected to a look fed by a solar heater and a heat pump. I'm wondering how to connect these heaters to the loop. I made these three drawings, but I'm not convinced which one - if any - I should choose. I'd like to have your input.

Thank you.

PS: apparently @Brambles replied to my initial post, but due to the forum update I have been unable to access his/her reply.
 

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