Overshooting the target temperature - options?
Are there any config options to limit this? Like limiting a heat request to 10mins within a 30min window.
Does Tado learn the ramp up time and estimate the momentum left?
I guess moving the thermostat closer to the radiator would help too...
Thoughts?
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This shows an example of the spike. We opened windows to cool the house again quicker, wasting the heat.
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How long have you had the Tado installed? It’s pid so it should learn not to overshoot.0
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I have the same problem. In my case it's been like this since several years. I have floor heating that may have much larger thermal inertia than a radiator. Not sure if Tado is capable to consider it or if it is using the same PID settings for all homes regardless of heating type. It is really annoying and wasting energy.
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It depends whether you're quoting temperature measured by trvs or room stats. Trvs will always have a bigger overshoot as they are measuring the heat around the rad. Roo stats are less affected.0
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October has been unseasonably warm, so solar gains can leave the controls standing. That happens here, although I am not saying that is the reason in your case.
However, heating demands have been very low so if your boiler water temperature is/was high that could cause overshoot - especially if the radiator/s are oversized (which, for other reasons, is good).
If it is set high, reducing your (condensing?) boiler temperature would bring significant gains in comfort AND efficiency.💲
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Thanks for all the replies!
It has been installed for approx a month. How long does it need to learn?
The temperatures are from wireless stats, not TRVs.
Good call on the boiler temp, it does seem to come on very hot. It's not something I've ever adjusted but I'll look into it.
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Do you know how your Tado controller (wireless receiver/ wired thermostat) is installed? If it’s relay you should be able to set the max flow temp on the boiler. If it’s digital you can now do it here https://model-selector.tado.com/
In either case, setting the max flow temp to 55c or below will allow the boiler to operate at its most efficient level (assuming you have a gas condensing boiler).1 -
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I have an oil boiler, which tado either switches on or off.
The boiler also heats the hot water when it's on. This is the only obvious place I see to adjust the temperature but I'm not clear if this is for the hot water, the radiators or both.
I have someone more familiar with boilers visiting this weekend and they might be able to poke around and advise now to lower the temp.
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I’d leave the temp as is with an oil boiler (unless you have a good idea what you’re doing). They operate totally differently.0
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OK, so wait for Tado to learn? I have the morning temp stepping from 19 deg C to 19.5 deg C but today, for example, it kept requesting heat until 19.8 deg C and the momentum carried the temp to over 20 deg C . It's taking a couple of hours to drop back to 19.5.0
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If your mate knows how to adjust the temp on the boiler without messing it up then try that. I know oil boilers can be very temperamental if you change the settings without knowing what you’re doing.0
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@johnnyp78 thanks for the link - https://model-selector.tado.com/
didn't know this was possible, i didn't have a max. setting, have changed to 55C, will see how i get on.
thanks
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@Ervcrt100 that’s only for digital connections (I.e opentherm). If your Tado device is connected via relay it won’t do anything.0
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@johnnyp78 yeh it's on opentherm.
the boiler took ages to turn off after setting this, not sure if this was a coincidence or not.
heating was set so not sure if it interfered with it, anyway, its back to normal
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@Ervcrt100 like @GrayDav4276 says, the boiler may run longer but there should be no problem running at a lower max flow temp. Just means your boiler is running more efficiently.0
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@GrayDav4276 @johnnyp78 you two are legends, thanks alot. i got worried and set it to 60 to see if it made a difference lol. i will set back to 55C.
thanks
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Tbh 60 or 55 won’t make a lot of difference anyway on a system with modulation - because you have a modulating system your boiler won’t always ramp up to 60, but if it’s set to 55 the boiler will never be operating above the dew point.2
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@johnnyp78 my mate reckons that min/max dial I showed will simple adjust the max temp. It's the same circulation of water that coils around the hot water tank as what goes through the radiators, simple enough. I'm going to give it a go.1
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Out of interest, is this purely for ‘opentherm’ communication or will it work with Worcester EMS?
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@Notascoobie good question. The documentation from Tado only mentions opentherm but i would have thought it's worth a try with ebus/ems.
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@GrayDav4276 it's an oil boiler so will be installed on relay, setting the max flow temp on the app won't make any difference anyway.
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Still struggling with this. I haven't messed with the boiler temp yet as I want to get a thermometer first to ensure the change doesn't cause the hot water to drop below 60C and introduce a risk of Legionella bacteria.
I'm experimenting with breaking the 0.5C steps into smaller steps to try avoid the overshoot.
But can anyone tell me why if the target temp is 19.5 is the system still requesting heat (level 2) when the temp is 19.9 and going towards? This is in the morning with outdoor temperature only getting warmer too.0 -
@joefish did tou managed to fix this? I recently bought Smart Thermostat Starter Kit V3+ and have the same problem - I expected more from the "smart" thermostat but it seems that it works same as any other dumb relay based thermostat. I hooked it over OpenTherm to my gas boiler and use it with underfloor heating, but the temperature keeps overshooting usually by 2C to uncomfortable level and Tado does not adapt to this0
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@joefish if you’re on oil and have a HW cylinder, you’ll likely not want to bring your flow temp down. Regardless of legionella, your HW probably won’t be hot enough for use and I suspect you don’t want condensation in your boiler heat exchanger due to corrosion risk.
Instead, you could try balancing down the radiators to ensure they don’t get too warm.
Good advice on balancing on heatgeek.com0
