UFH and Atag a325EC

17 Aug 2011
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United Kingdom
I am planning to replace my current combi boiler with Atag a325ec (after lots of reading from the posters on this forum). I also want to install a two zone UFH in 2 rooms downstairs. Can someone help me to understand how the boiler/radiator control (if there was no UFH) would integrate with UFH controls? The underfloor heating system is supplied with the Heatmiser thermostats and Heatmiser UH1 wiring centre.

1. ATAG manual says that only battery operated volt free thermostats can be connected. Heatmiser UH1 wiring centre is clearly not battery operated, but does have a volt free connection. Can it still be connected to ATAG?

2. Can the boiler (ATAG) have a UFH wiring centre connected and another thermostat to control the radiators as well? Or the radiator thermostat will go into the Heatmiser wiring centre as well, which, in turn, will manage all of the connections?

3. If the answer to the above is yes, should I buy another Heatmiser thermostat for the radiators to connect to the UH1 wiring centre and not the originally planned Siemens REV24RF?

I apologize for such a long post, but I really need help...
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