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PostPosted: Mon Jan 01, 2018 10:25 am 
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I have two electronic TRV heads which can be set to geofencing mode, but as it stands not appropriate for the house usage style. However the reaction times when set to cool over night and heat up again in the morning is slow, I have needed to cheat and set to 24°C instead of 20°C in the morning at 6 am to reach the 20°C by 8 am then back down to 20°C. Fact that this works and without the cheat it was 10 am before at 20°C clearly not a boiler capacity issue but a control issue.

I know at home with a Myson fan assisted radiator the warm up time is much shorter, 15 to 20 minutes warm up time, but most people don't use fan assisted radiators, and it really does not matter how big the boiler is or how big the radiator is, without fan assistance the warm up time is rarely less than an hour, may be I am wrong?

I see all these people fitting Hive and Nest the so called "Smart" thermostat which I assume like my "Smart" TRV head can be set to automatic set the temperature higher as one's phone approaches home, but they only ask how to wire, we never seem to get a report on if they actually work?

So for those with it installed the question is does geofencing work, or do you need to manually adjust the temperature?


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PostPosted: Mon Jan 01, 2018 12:01 pm 
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They don't work just by sensing you are on your way home, they "learn" when they expect you to be home and then come on in advance so that when you do arrive home the house will be warmed to the level you like. If the starting temperature is lower then it will start warming earlier so that when you get in at say 5pm, the house is warm, no matter how cold the house was to begin with. Also of course with them being smartphone linked you can override this if you tell the thermostat you are going to be late from work or early.

That's the theory of course, does it work in practice, I don't know, never used one, have no wish to use one.


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PostPosted: Mon Jan 01, 2018 12:06 pm 
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Seems to be a waste of money to me. Yes vaguely good in theory but the expense of all the kit required it will be doubtful if you will ever save enough to cover what it cost. What's wrong with coming home and keeping your coat on for a few minutes. We have had this debate before with just the "smart" room stats.

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PostPosted: Mon Jan 01, 2018 12:09 pm 
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You've mixed up two different features there.

Geofencing is just a method of switching the heating on when you get a certain distance from home.

The heating coming on early in order to get up to temp by a certain time is called start optimisation.

Some systems will do a version of both together but the geotagging usually had to be set so far from home that it's almost worthless

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PostPosted: Mon Jan 01, 2018 12:13 pm 
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I've got to agree with some of the others. However "clever" it might be, it's adding complication and cost for something that's not really a great benefit. Timer and stat is simple.


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PostPosted: Mon Jan 01, 2018 12:21 pm 
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someone-else wrote:
Seems to be a waste of money to me. Yes vaguely good in theory but the expense of all the kit required it will be doubtful if you will ever save enough to cover what it cost. What's wrong with coming home and keeping your coat on for a few minutes. We have had this debate before with just the "smart" room stats.


Horses for courses as always. If there's a family living in the house then it's probably not an issue as someone's always there to turn it on but if you live on your own like me and work odd hours plus you work away quite often unexpectedly it's really useful to have remote control over the heating.

Some features such as TPI, setback and modulating thermostats do directly save on gas but if you're looking at a properly expensive system like Evohome you're going to buy it for comfort reasons it will almost certainly cost far more than you'll ever save.

As for putting your coat on that depends entirely on the property. There are still a lot of older houses that will only achieve a temp rise of a couple of degrees an hour so if you get in at 6 and it's 12 degrees internally you can go to bed at 10 and it still not be 18 degrees, this is where setback temps come into play.

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PostPosted: Fri Jan 05, 2018 4:33 pm 
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I was supprised to see electric heaters with efficancy ratings which were diffrent from each other, I had considered with an electric heater 3 kW in must mean 3 kW out, I could not work out how one was diffrent to another.

This was explained as the time taken to heat up the room, compared with the time the room is used for, so room used for 1 hour and it takes 1 hour to warm up, system is 50% efficence.

So applying the same to central heating to have an economic system the heater must be able to put heat into the room fast, so radiator needs to hold very little water, the water only transfers the energy, it should not store it.

So we are looking at fan assisted radiators, however I have one, and there are also draw backs, main is the noise, but also forced circulation of air means your blowing the air over cold surfaces, so you need to be able to vary the speed so when speed is required you increase the speed, and once warm you reduce the speed.

However as you state you want to be able to start the process by some remote control, but with a system which circulates air the wall thermostat works quite well, the air is moved around, so with my house with a Myson the wall thermostat can switch on and 20 minutes latter the house is warm, so considering you only need house to have the house near to target when you get home, not fully heated up, so 15 minutes so yes Geofensing would work, however although I have a Myson in the main room, this is not how most houses are heated, the Myson is not that popular.

Mothers house after the central heat turns off the radiators stay hot for nearly an hour, in my house maybe 3 minutes if that, and the same with heating up.

So if you want Geofensing step one is fan assisted radiaors.

But you don't want them in the bedroom,


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PostPosted: Sun Jan 07, 2018 8:14 pm 
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Having had our Nest 3 for only a week I cannot say whether geofencing works in every situation and will be useful to us in the future.

However, recently my wife and I left the house to do some shopping and whilst we were out I checked the Nest app to see if it was working, after all it is a new toy for me to play with. :lol:

I had completely forgot about the Nest Away feature that I had enabled at set up but I can confirm that it had recognised that we were away and the result was that it had fallen back to eco mode.
When we arrived back and entered the living room the Nest had already gone back into Home mode and was heating the house so I can confirm in that particular situation geofencing appeared to work as expected.

Also, something that may be of interest since you mention you have Myson Fan assisted radiators.

Due to lack of wall space I have two Myson Kickspace heaters one at either end of our kitchen and I was worried that the lower flow temperatures associated with the way OpenTherm works would cause me problems. I have found that they both cut in even though the flow temp is lower than it used to be with TPI control but I have found that they are on for longer. So although the air coming from them is at a lower temperature because they are on longer they still heat up the Kitchen OK.

Also, I would recommend to anyone thinking of using Kickspace Heaters in a kitchen to fit a wall mounted thermostat as I have that will cut the mains supply to the fans when say the kitchen reaches 21c. This is useful as you don’t want the heaters blowing out hot air into an already hot Kitchen when the oven is on etc.



For this message the author PLB has received gratitude : ericmark
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