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Fair enough. It's a shame, I was hoping the Tado or some system could do this: A nest "heat link" or tado wireless kit that communicates with thermostats around the house. Replace the existing thermostats with the nest/tado wired thermostats, change the voltage to 24V or whatever they need...

Yeah I would like the external modulation for the supposed increased efficiency it provides. I'm not sure how much more efficient it is, but the thought of turning down the flow temperature to something like 30°C to maintain a 21°C thermostat temperature sounds pretty good. And there's also the...

Yeah I agree, PWM is a poor name, but seems to be what they call it. Isn't the end result the same though? The thermostat cycling on/off the valve indirectly cycles on/off the boiler in the same way. I think what you have described of the wiring is what I figured out from my googling. Behold...

Ohh I see, so it's just adjusting the flame to achieve whatever I set as the flow temperature on the boiler based on the temperature returning from the loop (amongst other things maybe). How do you know the thermostats have no PWM? Just from my googling, the second page from a post on this...

I'm confused as to how the boiler would know how to modulate. If it's 16°C in my house and I turn up one of the thermostats, which tells one zone valve to open, thus turning on the boiler - you say the boiler goes full on to begin with and then modulates back a bit. But how does it know if I'm...

Ooh interesting. From what I've read the thermostats I have do do modulation through PWM, which I will now call fake modulation. So the boiler raises the gas if the shower/taps are on high, or lowers gas if they're on low? And also raises gas if the return temperature from central heating is low?

I'm trying to learn how my boiler and thermostat deal with modulation. I have a WB Greenstar Compact CDi ErP Combi boiler. I believe it uses the EMS Bus for actual modulation (ie. controlling the flow temperature), but the manual suggests it can modulate without mentioning a requirement for EMS...

Thanks for sharing your set up. I just moved in to a new build with multi zone/valve set up; one thermostat for upstairs heating and another for downstairs. It's a combi boiler (WB Greenstar CDi Compact ErP) so hot water is on demand. I was wanting to install a Tado for modulation, as it has...