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What is the difference between the ES4 and
the ES4R?
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The ES4R has the usual mains inlet and
a rain water inlet. If rain water is available this refills
the cistern but when there is not enough rain water in the tank,
the mains water fills the cistern - automatically,
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Is the ES4R legal?
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Yes. The main issue is back-siphonage of the
rainwater into the mains water, Rain water is a 'class V'
supply so the air gap has to be AB. This is built into the
cistern making the ES4R compliant.
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What are the advantages over the other rain
water switching devices?
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It is unpowered and needs no monitoring so
the WCs require no extra power and work in power cuts. The changeover
is automatic!
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