You made me check and adjust my other comment:

https://www.aeg.co.uk/kitchen/cooking/hobs/induction-hob/ikb...

3.7kW for the main element.

Also, why would it be less efficient? Due to the distance?

Note that the 3.7kW element can only provide all that to a single vessel if it covers the entire area of the element.

The resistive element submerged in the water dumps very nearly 100% of energy into the water. The stove heating the kettle has many more sources of loss, but mostly that it first heats a piece of metal, which is not fully submerged in water.

In theory, in practice the induction heating on a regular pan is faster than my kettle by almost three times. YMMV on type of kettle and induction hob used. But it generally means that if you live in the US and you have an induction hob, there is absolutely no reason to buy a kettle.

You might want to decalcify your kettle.

Edit: Wait. Are you using a frying pan to heat tee water to make it faster?

My experience with US induction stoves is limited but I believe it can also deliver 3.5kW on boost. My induction stove boosts to 3.8kW for heating which beats my kettle significantly. I also measures the efficiency and it’s quite comparable.

What is the power of your kettle?

2200 Watts.