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Tado° thermostatic heads with or without a Tado° thermostat to replace the existing thermostat?

DazzleBird
DazzleBird ✭
in General Questions & Topics

Hello everyone,

I'm asking my question here because I couldn't find an answer elsewhere for my specific case.

I just moved to a new apartment. In my old apartment (which had a collective boiler, meaning no individual control, and no thermostat), I used a V3+ thermostatic head with a temperature sensor (for better accuracy in the middle of the room). I used it to control the only radiator I used in the living area.

In my new apartment, I have a Buderus Logamax boiler, controlled by a thermostat located in the main room, along with five radiators (two in the main room, one in each of the two bedrooms, and one in the bathroom). I was planning to buy V3+ thermostatic heads for all the radiators, but I’m wondering if I also need to buy a V3+ thermostat (wired or wireless) to control the boiler.

I see two possible setups:

1) Five thermostatic heads on each radiator + a temperature sensor in the main room:

  • Each thermostatic head is controlled and programmed individually based on its target temperature and heating schedule (different settings for each room).
  • For this to work, the boiler must always be "ready to heat."
  • The existing (non-Tado) thermostat should be set to a high enough temperature so that whenever a radiator needs to heat up, the boiler turns on (essentially keeping it in a "standby" mode).
  • I tested this by closing all radiator valves but setting a high temperature on the thermostat. The boiler did not turn on (at least, I didn't hear it, and my gas meter didn't move).
  • However, as soon as I opened a radiator, the boiler started.
  • Is this setup realistic without a V3+ thermostat?

2) Five thermostatic heads + a V3+ thermostat in the main room (+ optionally a temperature sensor elsewhere):

  • Whenever a radiator needs heating, the V3+ thermostat sends a signal to the boiler, which then turns on.

Clearly, the second option is more "optimal", but it requires an additional investment.
If the first setup works well, without increasing gas consumption or causing unnecessary wear on the boiler, why would I need to buy a Tado thermostat?
I'm not an expert, so I don't know if it's good for a boiler to receive a heating signal when the circuit (all radiators) is closed.
From what I see, my boiler doesn’t seem to run even if I set the thermostat to 25°C but keep all radiators closed (unless I’m mistaken).

Last question: based on the chosen setup, is it worth upgrading to the X series, or is V3+ sufficient, considering I already have a V3+ thermostatic head and a V3+ temperature sensor?

Thank you in advance for your help!

Answers

  • policywonk
    policywonk ✭✭✭

    This can be solved, but it would help to have reference to the following:

    1. What specific model of Buderus Logamax boiler is it? Some are controlled by basic on-off switching, most are controlled via whats called EMS-BUS digital control. Some are combi boilers, ie with two directly managed heat outputs, one for hot water, one for the radiators.
    2. What exactly is the model of the thermostat that controls the boiler? Is it wired directly to the boiler?
    3. The fact that it is an apartment raises a question, are you allowed to change wall thermostats?
    4. Are the radiators, the ones you want to update, already fitted with thermostatic control valves?

    Come back. Will help.

    The X series doesnt handle the EMS-BUS which is the most common digital control in the Logamax series. However V3+ does. It depends on the specific boiler.

  • DazzleBird
    DazzleBird ✭

    Thanks for the answer! I'll try to respond to each one of your question:

    1. It's a Buderus Logamax Plus GB172-24K. It's for radiators and hot water (no independant water tank)
    2. The thermostat is a Logamatic EMS RC35. It is located in the main room (while the boiler is in the the laundry) but is wired via the wall to the boiler.
    3. I'm the owner of the apartment. But in any case, if I change the thermostat, I just disconnect the current one and connect a Tado one, while keeping the old one "in case of".
    4. All radiators have currently thermostatic valves, and I plan to replace them by Tado ones.

    When you say that the X series doesn't handle the EMS-BUS, does it mean that a X thermostat couldn't control my boiler (if the actual communication between the Logamatic thermostat and the Logamax boiler is EMS)? That would indeed be a pity… And strange, no?

  • policywonk
    policywonk ✭✭✭
    Yes it is a pity, and strange. The existing thermostat install guide is here: https://www.manualslib.com/manual/832125/Buderus-Logamatic-Ems-Rc35.html?page=15#manual
    Suggest you contact Tado support via their website and ask them for the instructions to replace the existing thermostat and engage the boiler. Give them the exact model numbers. They should give you the written recommendations.
    Come back if you have hurdles.

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