Honeywell ST6400/CM61- upgrade to multizone

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16 Dec 2017
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Hi,

I have a Glowworm 30 SXi combi boiler and hot water tank run by a Honeywell ST6400 and Honeywell CM61 thermostat.

I wante to upgrade the system to a multizone system such as Honeywell Evohome.

I have read that the relay BDR91 is used - does this replace the St6400 or the Cm61?

Could someone indicate how much work it would be to upgrade these components to the Evohome solution.

Thanks

Frank
 
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