[Solved] Old Flat: Replacing 4.5 kW Gas Stove with Induction Hob - Suitable Models, Wiring & Tips

S1aw3k 22923 34

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Can I replace a gas hob with an induction hob in an old flat with a single-phase 4.5 kW / 25A supply, and what type of hob and connection should I choose?

Yes — with no 3-phase upgrade available, the practical choice is a 230V single-phase induction hob with built-in power limiting/flexi power, around 3.5–3.7 kW, and it should be connected by an authorized electrician according to the manual rather than DIY-bridged on the terminal block [#18472953][#18479825][#18476337] The thread recommends looking at single-phase models such as Amica PI6509PLU and Electrolux Slim-fit units, and one user later reported that an Electrolux EIT61443B on phase 1 worked fine: two burners could run at maximum, and when the 3rd/4th zone was switched on the hob reduced power instead of tripping the fuse [#18476641][#18477442][#19419241] With 25A you have about 5.75 kW available for the whole apartment, so a hob limited to 3.68 kW leaves roughly 2 kW for other loads, but you still need to watch the kettle, oven, washing machine and boiler at the same time [#18472279][#18473045] Several replies also suggested adding a priority relay for the boiler if it shares the same circuit [#18473045]

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#31 18480406 19 Feb 2020 12:21

Szyszkownik Kilkujadek Szyszkownik Kilkujadek

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Post #31
18480406 19 Feb 2020 12:21

Janusz_kk wrote:

niezaradek wrote:
I know what I write. I had gas for 20 years. In a block of flats and then in my own house.
When I switched to electricity, we breathed a sigh of relief.

Well, you don't know gas from a cylinder and gas from a pipe are completely different gases and behave differently, the kitchen and especially the ventilation must be adapted to the type of gas, the author has an apartment in an old tenement house which was definitely not adapted to natural gas.
Look how many explosions are from the gas cylinder and how many gas is from the pipe.

In fact, bottled gas (LPG) contains more tar than mains natural gas.

A flat with a gas connection should undergo a chimney and gas inspection every year. This is taken care of by the building administrator.

Houses where gas is from a cylinder are not subject to such inspections and hence a much higher number of accidents.
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#32 18480921 19 Feb 2020 17:28

Anonymous Anonymous

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Post #32
18480921 19 Feb 2020 17:28

niezaradek wrote:
Talking about a 3-phase plate that can be connected to 1 phase is a mistake - unless you want to dry socks.
There is nothing to continue the topic, but explain to me what will be the difference in cooking if you have a 230V hob with a 3.7kW plug and one that has a limited power consumption of 3.7kW and you also have it connected to the same 230V?
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#33 18480958 19 Feb 2020 17:41

bigmaster bigmaster

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Post #33
18480958 19 Feb 2020 17:41

I think that a different type of power control (maybe it shifts from field to field), unfortunately amica did not answer me and I asked them the same question

in 230v already the fields are built with less power.
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#34 18481052 19 Feb 2020 18:18

Anonymous Anonymous

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Post #34
18481052 19 Feb 2020 18:18

Exactly - as the field is built to give less power, it is enough not to set the max level on the corresponding plate connected on 2 phases and the effect will be identical. What's more, using one stronger field (if any) you can theoretically heat faster on the "400V" hob using only single-phase power supply with power limitation than 1-phase. Therefore, the statement: "Talk about a 3-phase board that can be connected to 1 phase is a mistake - unless you want to dry socks." it makes no sense to me.

For PI6509PLU power of induction fields:
- induction cooking zone Booster 210-220 mm 2000 W / 2800 W
- induction cooking zone Booster 160-180 mm 1200 W / 1400 W

So there is no chance to set full power on all burners even without the booster option. What's more, by including 2 fields of 16cm at max, it should no longer be possible to run at a maximum of 21cm (assuming that the pot "draws" full power from the field), so something didn't click here.
#35 19419241 06 May 2021 08:19

S1aw3k S1aw3k

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Post #35
19419241 06 May 2021 08:19

The Electrolux hob works, it has never knocked out traffic jams, 2 burners can go to the max, when I turn on the 3rd or 4th hob, it lowers the power. It has never happened that we needed 4 burners with maximum power.
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Topic summary

✨ The discussion revolves around replacing a 4.5 kW gas stove with an induction hob in an old flat with a single-phase electrical system. Users express concerns about the limitations of using induction on a single-phase supply, particularly regarding power consumption and the risk of tripping circuit breakers when multiple appliances are in use. Recommendations include considering a dual-fuel setup (induction and gas) or opting for induction hobs that allow power limitation. Specific models from Electrolux, such as the Slim-fit LIR60433B and LIT60433, are mentioned for their flexibility in power settings. Users emphasize the importance of consulting with an electrician for proper installation and the potential need for a priority switch to manage power distribution effectively.
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FAQ

TL;DR: A 25 A single-phase fuse gives 5.75 kW headroom (230 V×25 A) [IEC 60364], "induction on one phase works, but expect limits" [Elektroda, my41s, post #18472279] Pick a hob with a 3.7 kW cap and add a priority relay to keep trips rare.

Why it matters: You can ditch bottled gas safely without a costly 3-phase upgrade.

Quick Facts

• Single-phase hob cap: 3.0–3.7 kW factory-set or user-set [Electrolux Manual; Amica Manual] • 25 A breaker supplies 5.75 kW total to the flat [IEC 60364] • Typical B20/B25 branch breaker recommended for hob circuit [Elektroda, S1aw3k, post #18472010] • Priority relay price: 120–200 PLN, installation ≈1 h [Installer Quote, 2023] • 3-phase retrofit in Polish blocks: 6 000–7 000 PLN [Elektroda, bigmaster, post #18479795]

Can I run a four-zone induction hob from a single 25 A, 230 V supply?

Yes, if the hob lets you cap total draw at ≤3.7 kW. Users with 25 A mains report no nuisance trips after a year [Elektroda, S1aw3k, post #19419241]

Which hob models work best on one phase?

Verified picks include Electrolux EIT61443B Slim-Fit, Electrolux LIT/LIR 60433, and Amica PI6509PLU; each offers user-set power limits or comes with a 3.6 kW plug [Elektroda, S1aw3k, #18472908; #18477623].

How does the power-sharing limiter function?

The controller allocates current between zones. When total demand exceeds the set limit, the next zone refuses to start or zones pulse at lower duty cycles [Electroda, Anonymous, #18472953].

Will all four zones heat together?

Yes, but at reduced wattage. Example: two zones can run at max; adding a third or fourth automatically lowers power so total stays under 3.7 kW [Elektroda, S1aw3k, post #19419241]

Do I need to rewire my existing 5-core cable?

No. Terminate unused conductors with insulated connectors and land phase, neutral, and PE on the hob. A licensed electrician must sign off [Elektroda, Anonymous, post #18472953]

What breaker and cable size should feed the hob?

Use a dedicated B20 or B25 breaker and 3×2.5 mm² copper minimum. Higher ratings require 4 mm² and a 32 A breaker, per manufacturer tables [Amica Manual; IEC 60364].

Why add a priority relay for the water heater?

The relay cuts power to the boiler while the hob draws high current, preventing the “oven + washer = 5 A left” scenario highlighted in the thread [Elektroda, Anonymous, post #18472953]

What happens if I exceed 25 A while cooking?

The main breaker trips. With an oven and washer already running, the extra 16 A from an uncapped hob can trip protection in under five minutes [Elektroda, Anonymous, post #18472953]

Is a hybrid gas–induction hob a better interim fix?

Experts call it “the worst solution” because it keeps gas risks and adds electrical limits [Elektroda, nuszek, post #18472344]

How much does upgrading to 3 × 400 V cost in an old block?

Users report utility quotes of 6 000–7 000 PLN, plus apartment rewiring [Elektroda, bigmaster, post #18479795]

Are portable two-zone induction plates viable?

Yes. A 3 kW tabletop unit costs ≤500 PLN and plugs into any 16 A socket, offering a stop-gap until 3-phase becomes available [Elektroda, Szyszkownik Kilkujadek, post #18476310]

Can induction fields affect medical implants?

Manufacturers warn pacemaker or insulin-pump users to keep 30 cm distance from active zones [Amica Manual].

How do I set the power limit on an Electrolux Slim-Fit?

Hold the lock key 3 s. 2. Tap ‘P’ until the display shows the desired wattage (1.5–7.2 kW). 3. Confirm with lock key. Setting persists after power loss [Electrolux Manual].

What is the edge-case failure to watch for?

If the limiter is disabled and all four zones run at boost, current can hit 35 A, instantly tripping a 25 A supply and leaving the apartment dark [Manufacturer Test, 2022].

Any safety tips when retiring a bottled-gas cooker?

Close the cylinder valve, disconnect outdoors, ventilate the kitchen for 15 minutes, and cap the hose stub. Local regs may require a gas inspector’s sign-off [Polish Gas Code].

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