Posts tagged: Explanations

Which is Faster: Electric vs Stove-top Pressure Cooker

By , May 24, 2012

Our customers ask whether electric pressure cooker is slower than stove-top pressure cooker.  Someone claimed that stove-top cooker can be 2~3 times faster in reaching working pressure.  This may be possible with a gas-stove.  However the majority of North American families use electric stoves. We decide to run a test on this typical scenario.

Test equipments:

  • Instant Pot IP LUX60 heating stage 174x180 Which is Faster: Electric vs Stove top Pressure Cooker

    Instant Pot IP LUX60 at the heating stage

    Instant Pot IP-LUX60: 1000W, 6L inner pot. Plugged-into an electronic power meter (Kill-A-Watt P4400).

  • T Fal Safe 2 on Maytag electric range 180x135 Which is Faster: Electric vs Stove top Pressure Cooker

    T-Fal Safe 2 on Maytag electric range

    T-Fal Safe 2 Model 3271 stove-top pressure cooker, 6L capacity, which likely has a pressure rating of 11psi.

  • Maytag SuperCapacity Plus electric range with glass ceramic cooktop, coil element power rating: 2100W
  • Thermoworks Splash-Proof Super-Fast Thermapen, accuracy +/-0.4°C (0.2°F).

Test conditions:

  • Fill both Instant Pot and T-Fal with 3 liter tap water at 13.6°C
  • Set to cook at full pressure for 10 minutes. The “Manual” mode of Instant Pot was used.

After running multiple tests, the following is the results:

  • Instant Pot IP-LUX60 took 23:30 ~ 24:15 (minutes:seconds) to reach working pressure 11.6psi.  Hold pressure for 10 minutes. Total power consumption 0.35~0.36 KWH.
  • T-Fal on Maytag electric range took 24:05~24:50 to reach pressure (steam release started leaking steam and rotating).  Afterwards, power was turned down to 30% to maintain the pressure. Total power consumption based on the power rating: 0.945~0.974 KWH.

In conclusion,

  • The stove-top T-Fal + Maytag electric range take about 20~30 seconds longer to reach working pressure than Instant Pot IP-LUX60.
  • Instant Pot IP-LUX60 uses around 63% less electricity than the T-Fal in this specific test.

There are two possible explanations regarding the electricity consumption:

  1. The glass ceramic cooktop reduces heating efficiency. The whole stove was warm and the T-Fal radiated heat along the way. That’s where the energy had gone.
  2. curved 3 ply bottom of InstantPot cooking pot 180x68 Which is Faster: Electric vs Stove top Pressure Cooker

    Curved 3-ply bottom of Instant Pot stainless steel cooking pot

    Instant Pot has two layers of air insulation, which minimize energy leakage. The bottom of its inner pot is curved inwards which fits tightly on the heating element curved outwards. Thermal conduction is excellent.

When we first designed Instant Pot, the intention is to make it fast in terms of convenience.  A press-a-button set-and-forget smart cooker is our objective.   Now heating efficiency makes Instant Pot faster than stove-tops on an electric range.