Instantaneous Water Heaters
An instantaneous water heater heats water directly as it is drawn, without needing a storage tank - ideal where there is no room for a tank, or where hot water use is occasional and irregular.
Our range includes electric and gas instantaneous water heaters from CLAGE, Hakl, Q-TERMO, Rinnai, Vaillant, Junkers, Karma and other brands - from small single-point models for one washbasin to powerful apartment stations.
The key factor when choosing is output (kW) relative to the number and type of outlets, and whether you need a pressurized model (connected to the pipework, multiple outlets) or a non-pressurized one (a single outlet right at the heater).
We're happy to help with choosing and installation - write to us via the contact form or by email.
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Instantaneous water heaters
Instantaneous water heaters are considered the simplest devices for heating water. Thanks to their small size they can be installed above or below a washbasin, so opening the tap doesn't cause any water to run to waste unnecessarily. Some heaters run on electricity, others on gas.
More expensive instantaneous water heaters also have a small built-in tank, which makes heating more comfortable. The pre-heated water in the tank is used first, and only then does the instantaneous heating switch on. This sometimes prevents the heater from struggling to keep up with hot water demand. All instantaneous water heaters covered here are installed above the washbasin.
Frequently Asked Questions
- What output do I need for an instantaneous water heater? For a single outlet (e.g. a washbasin) 3.5-5.5 kW is enough; for a shower or several simultaneous outlets, electric models need 8-12 kW.
- Does an instantaneous water heater have to be connected to 400 V? Higher-output models (above roughly 6-8 kW) do, while smaller single-outlet models usually only need a 230 V supply.
- What's the difference between a pressurized and a non-pressurized instantaneous water heater? A pressurized unit is connected to the water supply and can feed several outlets, while a non-pressurized one is fitted directly to a single tap.
- Is an instantaneous water heater worth it instead of a storage tank? Yes, wherever there's no room for a tank or hot water use is occasional - it only heats water when drawn, with no standby heat losses from storage.
- Can an instantaneous water heater also run on gas? Yes, the range also includes gas instantaneous water heaters (e.g. Junkers, Karma), which require a flue for combustion gases and a gas connection.
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Good evening, I have this heater from you. The problem is that when I turn on the hot water, only cold water comes out, and even the LED on the heater doesn't light up at all - what could be the issue?
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Hello, please contact the service centre for that brand directly. Have a nice day.
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Hello, I'd like to ask whether you also sell gas instantaneous water heaters? And could you help me choose one? Thank you
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Hello, you can find gas instantaneous water heaters here: https://www.atria.sk/protherm-panda-iog-mini-19-1/ https://www.atria.sk/protherm-panda-iog-24-1/ Have a nice day.
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Hello, I'd like to buy an instantaneous water heater to fit under the kitchen sink. We don't often use the sink for actively washing dishes, since we have a dishwasher. I'm looking for an instantaneous water heater in the price range of around 150€ (+/- 40€), so it can be mounted underneath the sink, and I'd also like to know how it connects to the electrical supply. Thank you very much for your help.
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Hello, an under-sink instantaneous water heater we have available can be found for example here: https://www.atria.sk/clage-m3-snm-3-5kw-230v/ or https://www.atria.sk/clage-m3-end-3-5kw-230v/ Have a nice day.
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Hello. I'd need advice on the most suitable boiler for heating water and heating a flat of about 100 m2 with underfloor heating. What would you recommend? Is a boiler with a tank better or without? Thank you
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Hello, you can find a suitable boiler with a tank here: https://www.atria.sk/junkers-cerapurcompact-zsb-14-1-de-st-120-5-z-cw-100/ Have a nice day.
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Hello. In a flat for a 4-person family I need to heat hot water for the kitchen (sink) + bathroom (washbasin and shower). Right now there's a gas instantaneous water heater with flow ignition, but the temperature of the heated water fluctuates quite a bit. Once the water is turned on the burner fires up and the water is warm after a while. When I stop the water, the burner also switches off. When I turn the water back on, it's warm at first, but then cold water comes through until the burner fires up again. I need to achieve a stable temperature of heated water. I'm considering a gas storage water heater with a small tank. So that it has a small hot water reserve (about 5-20 l) and can keep reheating water continuously while showering. Could you recommend such a solution? Thank you
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Hello, a suitable gas instantaneous water heater can be found here: https://www.atria.sk/protherm-panda-iog-mini-19-1/ Have a nice day.
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Hello, we're interested in buying a gas instantaneous boiler. Our old 13-year-old boiler broke down. We're a 2-person family and we use the boiler 90% just for heating hot water (shower, washbasin and sink). All winter we heat with a fireplace and only switch the gas boiler on for heating occasionally (about 10 times a whole winter). Can you advise which boiler is right for us? Energy savings matter to us. Thank you.
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Hello, personally for your needs I'd recommend this boiler with a built-in tank: https://www.atria.sk/protherm-tiger-condens-18-25-kkz-42/ Have a nice day.
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Hello, which instantaneous water heater would you recommend? We're a 4-person family, we want to use it instead of a boiler, so also for showering. Thank you...
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Hello, a suitable gas instantaneous water heater can be found here: https://www.atria.sk/protherm-panda-iog-mini-19-1/ Have a nice day.
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Hello. I have a gas instantaneous water heater Turbo MAG CAR 14-2/0B. I need to replace it with a new one, since it no longer works. Which one would you recommend?
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Hello, personally I'd recommend this one: https://www.atria.sk/protherm-panda-iog-mini-19-1/ Have a nice day.
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We want to replace our kitchen unit and switch from gas to electricity as part of it - cooker, water heater. Right now we have a gas instantaneous water heater, a Karma, which is sufficient for us. I'm looking for an equivalent electric instantaneous water heater above or below the sink. Bringing 3 x 400 V into the kitchen is not a problem. Please advise on the best-value electric instantaneous water heater. Thank you and best regards. Gustav Mosendz
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Please, what's the difference between an electric digitally controlled instantaneous water heater and an electric hydraulically controlled instantaneous water heater without a tank. Thank you
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Hello. Unfortunately, we can't answer that for you in this case. Have a nice day.
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Hello, I'm looking for an electric instantaneous water heater that would heat 5000 l/hour. The water temperature should be 40 degrees Celsius. Can you help me with that? Thank you.
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Hello, I'd like to ask whether a gas geyser and an instantaneous water heater can be connected to propane-butane, since I don't have electricity at my cottage. Thank you
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Hello, such a connection is probably possible, but for more detailed information you should contact a service technician. Have a nice day.
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Hello, I'd need to fit out a small bathroom at our cottage, which is only used occasionally - on weekends in the warmer spring and autumn, and during summer holidays by our five-person family. The cottage has a water supply built by the settlers themselves when the cottage community was founded - so we only have untreated cold water. The bathroom has a shower and a washbasin. Thank you, Monika
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Hello, I'd need some advice. I'm looking for a water heater where the temperature can be adjusted remotely. The heater will be located far away and I need something I can use to control it. Can you advise me on anything?
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Hello. I'm not sure whether a heater can be controlled remotely with a thermostat. We only offer thermostats. Have a nice day
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We own a gas storage water heater QUADRIGA 80 l. MICRO flue combustion. The outer casing is damaged by rust. Please could I buy a replacement outer casing and fit it. After some years it started rusting. Thank you.
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Hello. As far as I know that can't be bought separately, the whole tank needs to be replaced. Have a nice day
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Hello, I need to sort out hot water heating in a flat in a panel building. We're on a higher floor, the pressure fluctuates. So far our Junkers WR 14 has been holed by the fitter, who cleaned it fully soaked in acid. Is there anything with a tank as well?
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Hello, with a tank you can only buy a boiler+tank set, or another option is a storage water heater, which could be mounted above the washbasin, though these tend to be large, so they're not exactly the best solution for smaller spaces.