
Originally Posted by
jvallis
Heat Genius vs Evohome:
HG Pros:
- Separate temperature-gathering device to TRV
- Same device as temperature gathering is also PIR to determine room occupancy, leading to their unique 'Footprint' feature: auto scheduling depending on when you actually use the room
- Devices all use Z-Wave, and are mostly Danfoss devices (Danfoss is another huge company like Honeywell), and thus can be used with other Z-Wave controllers if HG dies/something better comes
- Totally open, and can connect just about anything to the Z-Wave mesh network. HG isn't as good a controller for general Z-Wave, but it's the best (obviously) for scheduling
- You can use any cheapo Smart Plug to 'boost' the mesh network. Useful e.g. to turn on a coffee machine in the morning or warm up your electric blanket.
- Limit is 255 devices in the Z-Wave network. You will need to have at least 2 devices per zone a whole house stat and the boiler relay. That means max zones is 127.
- Software is a web app, both wrapped as an iOS app and in browser
- Can do UFH, multi zone-valve heating (ie S-Plan+), and electric heating
HG Ambiguous:
- Footprint does work quite well, but you don't really need it if you have a good schedule
- A Birmingham startup vs a huge multinational
- Sat on their lead a little too long - Tado, Netatmo and Wiser all have multi-zone heating options now, so the USP is fading fast
- Has quite detailed graphing, but not amazingly useful. But as evohome doesn't have this at all, its a plus. Would be even more useful with a boiler-on curve and a summary of boiler-on time per month, and heat up times
- Has quite intuitive icons for pre-heat and you know if the heating is on in a zone
HG Cons:
- No Opentherm: TPI only
- Doesn't do setbacks well. TRV is set to say 17.5 and at temperature but another zone is firing, you are going to notice heat in the 17.5 zone heat up.
- More expensive due to the need to use 2nd sensor in room
- Room Sensor doesn't have humidity tracking (mind you nor does evohome) - this would be useful as humidity affects the 'feels like' temperature (e.g. Humidex).
- Software can be a little ropey and unresponsive at times (means you have to quit and restart it on phone)
- Not very secure (punches a hole in the firewall)
- Can get a little confused at times
- Software updates very slow
- PIR isn't very good, and the system isn't real-time responsive by any means
Basically, if you're oil fired (ie no OpenTherm) there's no difference at all between evohome and HG. If you have > 12 zones then you *need* HG.
For single-zone either get a Nest or a Honeywell Round (both can do OpenTherm too)
For all other scenarios, use evohome.