Nest Thermostat dual heat source equipment settings unavailable for the second source

[MrGuzzy]

I require assistance to configure my 4ht gen Nest thermostat.

My home has both radiant floor and forced air heat.  I'm unable to configure this equipment properly because the option isn't available to do so.  I contacted support before purchasing the thermostat and I provided photos of the wiring to verify compatibility.

I've wired the radiant source as W1, and the forced air as W2. The wires are identified, but I can only configure the primary heat source, not the secondary, see the attached screenshots.  Any assistance would be greatly appreciated, thank you.

[CoolingWizard]

@MrGuzzy, 

There is not a residential thermostat in existence that can do what it is you’re trying to do. Normally, when you have two distinctly separate heat systems, each would have its own thermostat controlling the area in which it’s located. The best you can do is make your gas heat, your primary heat W1, and your second heat or stage two heat would be the radiant heat. in this configuration, only if the gas heat cannot keep the house warm while running it would turn on the radiate heat as secondary stage two additional heat.

the only way you can do what you’re trying to do is to define it as a dual fuel system in which case there would be a change over from one heat source to the other however that configuration only exists when you have a heat pump with a secondary fuel source heating system, such as gas furnace.  

Frankly, it makes no sense to design a system which uses gas forced air heat with a second heating system being a gas boiler supplying hot water to radiant heaters. 

AC Cooling Wizard

[MrGuzzy]

Thank you for the informative reply.

I'm going to try using the learning thermostat for the forced air, and a seperate non-learning thermostat for the radiant floor heat. I'll then setup a simple temperature schedule for the non-learning and let the learning one do it's thing and optimized the more costly forced air heating.