Can a Greenstar Heatslave be used on an direct system?

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Choice of solar direct coil or Open vented ports on my Gledhill Sol Thermal store. I'm hooked up to the Solar coil at present but it is low in the store. Me I just thought heat rises, but the OV boiler ports are nearer the middle where CH flow comes out of the store, so get that part hot first could be a priority?

But can a modern boiler operate ok with only the pressure that 300L of water 18 feet above it can provide?
 
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No, it's MUCH better on the coil. Otherwise you'd have cold water at the bottom of the store which can never be heated by anything!
 
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I hooked up to the coil, but I reckon the return temperature is higher than preferable and so the boiler is cycling and not getting into condensing mode.

So I'm guessing I should fit a radiator to dump some of the heat, is there an easy way of calculating what size that should be?
 
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The saving made by the lower return temp would be easily outweighed by the fact you're heating a radiator unnecessarily. It's just robbing Peter to pay Paul.
 
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