General information on sealed combustion water heaters

Closed-circuit water heaters are safe because they draw in the air from outside for the fuel-burning (combustion) and also discharge the combustion gases to the outside. The gas burning process is sealed and isolated from the indoor air of your home. So you do not use air from the room itself and there are no combustion gases in the room where the water heater is located. This makes the water heater ideal for rooms with limited ventilation or for indoor use in general. You therefore need a flue pipe that consists of 2 pipes (concentric), an inner pipe for the combustion gases and an outer pipe for the fresh air. Because the exhaust gases are discharged through the inner pipe, the outer pipe also remains a lot cooler for your safety. Please note that the inner pipe is not plastic but metal, otherwise it might deform/melt and cause problems. Pay extra attention to the rubbers that connect different drain pipes, as this can be the cause of malfunctions.

For your technical error's see below:

  • Error's display TTulpe C-Meister 11 & 14
  • Error's display TTulpe C-Meister 13
  • Frost protection
  • Contact

Inportant Details TTulpe C-Meister 11 & 14

We recommend hiring a qualified installer for all our water heaters and reading the manual carefully. NEVER use the water heater without a flue gas outlet. In the event of malfunctions, check the message in the manual and remove the problem before restarting the water heater. Also check before installation which flange you should use for your drain, see your manual page 10!

Should fault AL01 occur, check carefully whether the drain has been installed correctly and that the correct flange has been used. Failure to remedy the cause of the AL01 will result in a permanent AL62 failure, which means that the water heater must be returned, this is not covered by the warranty!

Error codes with your closed water heater TTulpe C-Meister 11 & 14

It is annoying if your (new) device does not work after installation. We will do our best to provide you with a working device. It is important to install the water heater as prescribed in the manual, we would like to ask you to consult it before contacting us. Before going through one of our FAQs, it is important to look and listen to what the geyser does and does not do. This can provide clues to determine the problem. Our service team can also ask about this! Closed water heaters have various error codes if something goes wrong. Below are several common malfunctions and how you can solve them.

AL01; There is something wrong with your drain, check that you have used a concentric drain, that all rubbers close the connections properly and that you have used the correct flange. Also check that the fan is properly mounted. Once you have made sure that everything is correct, reset the device according to the instructions in the manual and try again. If the problem recurs, contact technical support.

Attention! Failure to remedy the cause of the AL01 will result in a permanent AL62 failure, which means that the water heater must be returned, this is not covered by the warranty!

AL02; The outgoing water is too hot, check whether there is enough water flowing through the geyser, possibly that a pipe is pinched, or the pipes have too small a diameter.

AL28; Check the connections. Disconnect the water heater from the mains before removing the cover. After checking, replace the hood and repair the drain if necessary before switching the water heater back on.

Error codes with your closed water heater TTulpe C-Meister 13

Before you start, always remove the plug from the socket and turn off the gas supply. You can remove the cover if necessary by removing screws on the bottom and top. Note that the hood is A cord still connected to the electronics, disconnect the connector before putting the cover away.

E0 & E4; Temperature sensor hot ( E0 ) and cold (E4 ) a white wire that goes into the copper pipe by means of a brass nut, check whether it is correctly placed and the connector is properly connected. Reconnect the water heater and the pipes and start the water heater. If the problem persists, please contact info@kiip.de

E1; The most common faults of all occurring fault codes. The solution can be in front of the geyser or after the geyser.

For the geyser; there is something wrong with the gas supply, this could be wrong gas pressure, too little gas, too thin and/or too long pipes. The gas pressure regulator does not work. We recommend using gas pipes of at least 10mm, larger if significantly longer. Is the gas bottle still full, is the pipe not clogged or is a shut-off valve turned on? Do you have the right gas pressure regulator for your geyser and the P30 geyser needs a pressure regulator of 30mbar and a P50 one of 50mbar. Never use an N25 (natural gas) with butane, propane or LPG and vice versa. If you have a gas pressure regulator with rupture protection, it can operate when a gas bottle is changed or if it is incorrectly installed (position). Gas pressure regulators can break. Replace it as a precaution, if the above is in order.

After the geyser; there is something wrong with the flue gas outlet. Drains are essential not only for your health but also for the proper functioning of the water heater. In order to be able to comply with the current (stricter) regulations, in particular the NOx emissions, modern geysers have been adjusted more precisely. Your current drain may not be sufficient for the new water heater. Make sure that drains never become narrower than the diameter they start with, they can be wider. The geyser detects if something is wrong and the combustion gases are not properly discharged. Possible causes may include:

  • You have installed a single outlet instead of a concentric one.

  • The gaskets between the various connections are faulty, the geyser is sucking in oxygen-poor air.

  • Flexible pipes slow down the air flow enormously, especially if they run in bends, replace them with fixed bends if possible.

  • Concentric flues with a plastic inner pipe are unsuitable for exhaust gases, they melt/deform. Replace them with concentric flues with a metal inner pipe suitable for temperatures up to 200 degrees.

  • Check that the flue is not blocked by a bird's nest or other foreign objects that do not belong there.

  • The minimum length of the flue pipe must be 70 cm.

E5; Check that the inner pipe at the top of the water heater is not loose.

E8; If your flue is very long or curved, this may cause problems with the discharge of combustion gases. Other causes can also trigger this failure:

  • Check that the water heater is supplied with the correct pressure and the correct amount of gas. For a 30 mbar water heater, fit a 30 mbar gas pressure regulator; for a 50 mbar water heater, fit a 50 mbar gas pressure regulator. The gas pressure regulator must also allow at least 1.5 KG/h, 2 kg is even better.
  • Check that the gas outlet pipe is properly connected; there should be no blockages or leaks.
  • We recommend a gas pipe with an average thickness of 10 mm or even 12 mm or 15 mm, depending on the length of the pipe.

If you have checked everything and the water heater still gives error message E8, you can request our E8 procedure at info@kiip.de.

Resonance of the water heater, the vibration and abnormal noise of the geyser

The cause of resonance is as yet unclear. Contact us via info@kiip.de and send a video along (possibly via We-Transfer), in the meantime do not use the water heater. Resonance can be harmful to your installation. If you have a resonating water heater, we have a procedure for you that will enable you to remedy the resonance.


It is important to protect your water heater against frost. In particular, geysers that hang in unheated rooms can freeze through the drain due to cold. This is not covered by the warranty. So protect your device well, especially if you do not use it for a longer period of time, then let it drain by means of the drain valve. Store in a heated room is our advice. This way you can fully enjoy your water heater again the following year. If something has frozen to pieces, you can find the right part on our parts page.


If you encounter other irregularities, do not hesitate and contact us at info@kiip.de. Add photos (of the installation) and we will contact you as soon as possible for information/instructions. Do not forget to add your (copy) purchase receipt.