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Can the radiator be completely shut off with a thermostatic valve?

adam.krakus 19869 16
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Can I use a thermostatic radiator valve to completely isolate a radiator for replacement in a district-heating system?

No — a thermostatic valve can close the supply side, but it does not fully isolate the radiator, so water can still come in from the return side and you cannot remove the radiator safely unless the installation is drained or there is also a return shutoff valve [#18493562][#18493662] The valve normally meant for radiator removal is a regular shutoff/isolation valve on the return, not a thermostatic valve, and replies note that thermostatic valves on the return make little sense [#18493607][#18494628] One reply also warns that putting a thermostatic valve on the outlet/return would bypass the intended regulation [#18494783] Some thermostatic valves can be set to “0”, but others only close down to about +16 °C, so they should not be treated as a guaranteed full isolation device [#18493662]
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  • #1 18493488
    adam.krakus
    Level 7  
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    Basically, my question is as in the title (I can`t find the answer anywhere, it`s probably somewhere, but I find a lot of similar topics):

    Can the radiator be completely shut off with a thermostatic valve?

    By the way, the second question - if the valve in front of the radiator at the input is closed, should the water not drain from it after some time and should it be empty? The question is whether, if the water is turned off at the entrance, can the radiator be removed without fear that water will flow from the outlet - this applies to standard heating, the so-called What about the network in the block - I want to replace the radiators.

    Additionally: the cooperative does not allow the installation of valves (except thermostatic valves). I already know what it`s about - automatic opening when the temperature drops appropriately. Can I install such a thermostatic valve on the outlet and, if necessary (e.g. renovation, radiator replacement), completely turn off the outlet with it?
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    #2 18493562
    stanislaw1954
    Level 43  
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    adam.krakus wrote:
    Can a thermostatic valve completely shut off the radiator?
    you can, but only from the power supply side - i.e. hot water.
    adam.krakus wrote:
    if the valve in front of the radiator is closed at the entrance, shouldn`t the water drain from it after some time and it should be empty. The question is whether, if the water is turned off at the entrance, can the radiator be removed without fear that water will flow from the outlet - this applies to standard heating, the so-called What about the network in the block - I want to replace the radiators.
    Unfortunately, water will flow in from behind.
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  • #3 18493596
    adam.krakus
    Level 7  
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    Okay... but if you can thermostatically close the entrance, then:
    1. Is this done first by setting it to 0 or does the valve need to be secured somehow?*
    2. If I install such a valve at the outlet - can it be closed? If so, shouldn`t it prevent water from flowing in from the outlet?

    * I don`t understand how the thermostatic valve works... if it can be closed with hot water, why not with cold water? After all, complete closure is complete closure(?).
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    #4 18493607
    stanislaw1954
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    1 is closed to "0".
    2, shut-off valves are installed at the output, which are useful when replacing radiators.
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    #5 18493662
    Zbigniew Rusek
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    Yes, there must also be a valve on the return. Without it, you cannot remove the radiator when the installation is filled with water. The thermostatic valve in the supply should close the supply, unless it is a valve in which it is not possible to completely close it, but only up to +16 degrees (but if = despite turning off the heating - it was over 16 degrees in the room anyway, it will close). Remember that the pressure is not only on the supply, but also on the return.
  • #6 18494614
    adam.krakus
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    stanislaw1954 wrote:
    2, shut-off valves are installed at the output, which are useful when replacing radiators.
    Are these valves also thermostatic? This question may sound stupid... but in a letter from the cooperative I received information that only such valves can be installed. In other words: is there a thermostatic valve at the outlet so that I can easily cut off the radiator and remove it?
  • #7 18494628
    stanislaw1954
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    There are no thermostatic valves on the return (it makes no sense), one on the supply is enough.
    Send a letter to the cooperative stating that you want to install a thermostatic valve on the supply and a shut-off valve on the return. What will they reply?
  • #8 18494680
    adam.krakus
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    "due to installation measurement, it is not allowed to install cut-off valves in the installation before radiators (does not apply to valves with thermostatic heads)"
    Exactly something like that. This is probably to avoid removing the radiator, etc. in order to avoid fees... they officially informed me that it has a bad technical impact on the installation (places where scale is deposited; the plumbers laughed at it). That`s why I want to install a thermostatic one, open it permanently and cover it :) and close if necessary.

    On the other hand, I don`t know how to interpret it either. In front of the radiator it may as well mean the entrance, and the exit is "behind the radiator"(?).
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    #9 18494772
    stanislaw1954
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    adam.krakus wrote:
    in connection with installation measurement it is not allowed to install cut-off valves in the installation before radiators (does not apply to valves with thermostatic heads) "
    Exactly something like that.

    Added after 1 [minute]:

    adam.krakus wrote:
    open it permanently and seal it
    Now it`s me who doesn`t understand.
    adam.krakus wrote:
    In front of the radiator it may as well mean the entrance, and the exit is "behind the radiator"(?).
    Just like that.
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    #10 18494783
    palmus
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    In my opinion, if you install a thermostatic valve on the drain (outlet) of the radiator, you will bypass their regulation, because they did not foresee it.
    All you have to do is empty the installation of water.
    Moreover, each radiator, except Favier and cast iron finned radiators, is equipped with a valve at the outlet (outlet) to hydraulically balance the installation.
    They can`t stop you from doing it.
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    #11 18495954
    Zbigniew Rusek
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    These return valves are not intended to balance the installation (orificating), as this is done in the supply via a thermostatic valve. Rather, these return valves are intended to enable the radiator to be isolated from the installation in the event of damage and leakage, without having to drain the water from the entire installation. The probability of a leak in the case of a cast iron radiator is close to zero (these radiators are durable), so there was no need to use shut-off valves on the return (but, for example, a Faviera radiator may rust, but it is still more durable than a panel radiator and can withstand much higher pressure).
  • #12 18496639
    Wojewoda82
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    adam.krakus wrote:
    "due to installation measurement, it is not allowed to install cut-off valves in the installation before radiators (does not apply to valves with thermostatic heads)"
    Exactly something like that. This is probably to avoid removing the radiator, etc. in order to avoid fees... they officially informed me that it has a bad technical impact on the installation (places where scale is deposited; the plumbers laughed at it). That`s why I want to install a thermostatic one, open it permanently and cover it :) and close if necessary.

    On the other hand, I don`t know how to interpret it either. In front of the radiator it may as well mean the entrance, and the exit is "behind the radiator"(?).


    This is probably, as you have figured out, to prevent combinations with replacing radiators during the heating season. A shut-off valve on the supply (it can also be thermostatic, as long as it is not blocked at 16 degrees), and especially on the return, would enable a quick replacement of the radiator.

    There are probably dividers and the smarter ones would have 2 sets of radiators. With a divider for the basement and a second radiator without a divider for the heating season.

    Now he won`t do anything anyway, maybe he will flood his apartment. He must wait for the end of the heating season and information from the cooperative that the central heating has been emptied of water.
  • #13 18496691
    palmus
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    There is also an element of the ban on "not heating" in cooperatives, apart from replacing radiators. Tenants are forced to collect heat so as not to heat the apartment with the heat of surrounding neighbors. This means that radiators cannot be removed. There was a court judgment in this case.
  • #14 18496972
    adam.krakus
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    Sure... I understand the legal issues...

    the problem is that it would be enough to put some seals on these valves to avoid the above, and access to the radiators is then "immediate" if necessary.
  • #15 18497206
    Zbigniew Rusek
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    palmus wrote:
    There is also an element of the ban on "not heating" in cooperatives, apart from replacing radiators. Tenants are forced to collect heat so as not to heat the apartment with the heat of surrounding neighbors. This means that radiators cannot be removed. There was a court judgment in this case.
    What if someone wants to paint the wall behind the radiator?
  • #16 18497252
    stanislaw1954
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    Zbigniew Rusek wrote:
    What if someone wants to paint the wall behind the radiator?
    A perverse question - everyone is allowed, but if only a thermostatic valve is allowed, which, however, does not close below 16 degrees, even if a shut-off valve is installed on the return, it is still impossible to remove the radiator without draining the water from the system or freezing the pipes.
  • #17 18498270
    Zbigniew Rusek
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    stanislaw1954 wrote:
    Zbigniew Rusek wrote:
    What if someone wants to paint the wall behind the radiator?
    A perverse question - everyone is allowed, but if only a thermostatic valve is allowed, which, however, does not close below 16 degrees, even if a shut-off valve is installed on the return, it is still impossible to remove the radiator without draining the water from the system or freezing the pipes.
    This would be possible if the temperature in the room - despite the heater being turned off - is definitely above +16 degrees, and this - contrary to appearances - may even occur in winter, especially when there is sunlight on a high floor or when the rooms next to it are heated. The temperature in an unheated room located in a heated building is different from that when the entire building is unheated.
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Topic summary

✨ The discussion revolves around the functionality of thermostatic valves in radiator systems, specifically whether they can completely shut off a radiator. It is established that while a thermostatic valve can close the supply side, it may not prevent water from flowing in from the return side unless a separate shut-off valve is installed. Users express concerns about the implications of closing valves during radiator replacement and the cooperative's restrictions on valve installations. It is noted that only thermostatic valves are permitted, which complicates the complete isolation of radiators without draining the system. The conversation highlights the importance of understanding the operation of these valves and the legal and technical constraints imposed by the cooperative.
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FAQ

TL;DR: Most thermostatic heads have a 16°C anti‑frost stop; as one pro notes, "does not close below 16 degrees." To remove a radiator mid‑season you need the system drained or pipe freezing, even with a return shut‑off. [Elektroda, stanislaw1954, post #18497252]

Why it matters: Apartment residents on central heating need safe, compliant ways to isolate or replace radiators without flooding or breaking co‑op rules.

Quick Facts

Can a thermostatic valve fully shut off my radiator?

Yes, on the supply (hot) side, if the model allows full closure. Some heads limit closure to about 16°C for anti‑frost protection. That limit prevents total shutoff in cooler rooms. You still need a return shut‑off to isolate the radiator for removal. [Elektroda, Zbigniew Rusek, post #18493662]

How do I close a thermostatic head—do I just set it to 0?

Yes. Turn the thermostatic head to 0 to close the supply side for that radiator. This is the normal user operation. For service isolation, also close a return shut‑off if fitted. If no return shut‑off exists, the radiator remains connected to the system. [Elektroda, stanislaw1954, post #18493607]

If I close only the supply valve, will the radiator empty by itself?

No. Water will still enter from the return side. “Water will flow in from behind.” You must also close a return shut‑off to stop flow. Without it, the radiator stays pressurized by the return line. This is why two valves are used for safe isolation. [Elektroda, stanislaw1954, post #18493562]

Can I put a thermostatic valve on the return (outlet)?

No. “There are no thermostatic valves on the return (it makes no sense).” Install the thermostatic valve on the supply. Use a simple shut‑off (service valve) on the return if your building rules allow it. That combination supports control and maintenance. [Elektroda, stanislaw1954, post #18494628]

What valve do I need on the return to remove a radiator?

A return shut‑off valve. Without it, you cannot remove the radiator while the installation is filled. The return remains under pressure, so closing only the supply is insufficient. Fit a return service valve if permitted, or plan for a system drain. [Elektroda, Zbigniew Rusek, post #18493662]

How do I isolate a radiator for replacement (3 steps)?

  1. Turn the thermostatic head on the supply to 0.
  2. Close the return shut‑off valve.
  3. Drain the radiator locally, then loosen the unions and remove it.
    These steps assume both valves exist and are functional. Otherwise, wait for a system drain. [Elektroda, stanislaw1954, post #18493607]

Why does my cooperative forbid shut‑off valves before radiators?

To protect heat‑metering and prevent radiator swaps during the heating season. Some people might keep a second radiator without a divider to game costs. Buildings then require you to wait until the system is drained at season’s end for changes. [Elektroda, Wojewoda82, post #18496639]

I only want to paint behind the radiator—can I remove it mid‑season?

Usually no. If only thermostatic heads are allowed, many “do not close below 16°C.” Even with a return shut‑off, you still need the system drained or to freeze the pipes to remove it safely. Plan work for the off‑season when possible. [Elektroda, stanislaw1954, post #18497252]

My room is warm from sun and neighbors. Can a 16°C‑limited head still close?

Yes. If the room stays above 16°C, the thermostatic head can close the supply even in winter. “This may even occur in winter.” Solar gains or adjacent heated flats can raise ambient temperature above the anti‑frost threshold. [Elektroda, Zbigniew Rusek, post #18498270]

Are return valves for balancing or just isolation?

They primarily isolate radiators for leak repairs or replacement. Balancing is typically handled at the supply via thermostatic valves. Cast iron radiators have low leak risk; panel radiators are more vulnerable. “Return valves are intended to enable the radiator to be isolated.” [Elektroda, Zbigniew Rusek, post #18495954]

Is there pressure on the return line too?

Yes. “Remember that the pressure is not only on the supply, but also on the return.” Closing only the supply will not depressurize the radiator. This is why a return shut‑off is essential for safe isolation. [Elektroda, Zbigniew Rusek, post #18493662]

What’s the risk of swapping radiators without draining the system?

Flooding. As one expert warns, “maybe he will flood his apartment.” Cooperatives empty the central heating at season’s end; plan work then. Attempting mid‑season work without isolation risks water damage and violations of building rules. [Elektroda, Wojewoda82, post #18496639]

Can I install a thermostatic valve on the outlet and cap it to bypass rules?

That attempts to bypass the stated regulation. “If you install a thermostatic valve on the drain (outlet) ... you will bypass their regulation.” Confirm any changes with your cooperative in writing before proceeding to avoid penalties. [Elektroda, palmus, post #18494783]
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