Honeywell CMS927 and Intergas

[Razor900]

Like all the internet enabled systems reviews that are more than 6 months old are out of date the system gets revised so often!!

The new stats are sexy touch screen units. One black and one white.

They look similar to an iPhone type thingy

 

[JamboChris]

The boiler and thermostat is for my Dad. I don't think he has ever touched it It's a CM900 and works well/does what he needs. I think that Intouch maybe a bit too much info in his situation.

Do we keep the CM900 and add an external sensor or do we change the thermostat to a CMS927.... Any thoughts?

Thanks.

 

[muggles]

The 927 is OpenTherm so it should be a bit more efficient

 

[Dan Robinson]

The 927 is OpenTherm so it should be a bit more efficient

No its not. Have you read the post on the IIC I did about this?


OP. Before buying another stat, see if the existing one works. Either way, you don't need an external sensor. This is half the point of the whole Eco RF system.



What has the installer said about it?

 

[JamboChris]

Our installer just said that our current thermostat would be ok.
Don't you need an external sensor if you don't use a CM927 or open therm thermostat if you want compensation?

 

[muggles]

The 927 is OpenTherm so it should be a bit more efficient

No its not. Have you read the post on the IIC I did about this?


OP. Before buying another stat, see if the existing one works. Either way, you don't need an external sensor. This is half the point of the whole Eco RF system.



What has the installer said about it?

Isn't it? I was told it was! Haven't seen your post; will dig it out

 

[Dan Robinson]

Don't you need an external sensor if you don't use a CM927 or open therm thermostat

If you have a honeywell stat correctly bound to the boiler, it compensates itself based on internal reference.

OpenTherm is just a communication language, but an OpenTherm compliant stat can do various things, some use an external sensor; some don't.