To boil off a gallon of water in an hour it takes about 2,400 watts delivered (not counting that lost to heat transfer) for that hour. So if you lose ~750 watts through the kettle sides you will want a 3.15kW element.

## How much energy does it take to boil water?

Phase changes in pure water occur at a specific temperature. At 1 atm, water freezes at 0° C and boils at 100° C. The energy required to change water from a liquid to a solid is 333.7 kJ/kg while the energy required to boil water is 2257 kJ/kg.

## How many watts does it take to heat water?

A typical 50-gallon electric tank runs at 4500 watts.

From above, heating a gallon of water by 1F takes 8.33 BTU. Heating from 68F to 104F would by a 36F rise, or 36 x 8.33 = 300 BTU to heat 1 gallon of water.

## How many watts do you need to boil a kettle?

In electric kettles the water is in direct contact with the heating element, there is no pot to heat and most kettles include an integrated lid. The electric kettle averaged around 1200 watts and took 125 seconds to boil the water, which translates to 0.04 kilowatt-hours (kWh) of electricity consumed.

## How many kWh does it take to boil 1 Litre of water?

Based on the above answers and examples, to boil 1 litre of water from 20C to 100C, requiring 0.183 kWh of either electricity or gas, at todays energy prices GAS is 68% cheaper than electricity.

## Is it cheaper to heat water with gas or electric?

Gas is much cheaper than electricity if you are using it to heat the same amount of water. But some immersion heaters only heat water at the top part of the tank, so if that ‘sometimes only once a week’ demand for water is just for a small amount, the immersion heater could still be cheaper to run!

## What is the most energy efficient way to boil water?

For appliances – microwave, electric tea kettle, electric stovetop – the most efficient appliance is the one that can boil water while pulling in the least amount of electricity via its plug.

## How hot is 1000 watts?

700 Watts in microwave >> like cooking at 350 degrees 800 Watts >> 450 degrees 900 Watts >> 525 degrees (Self clean) 1000 Watts >> 575 degrees 1100 Watts >> 625 degrees (Blow torch!!)

## How many watts do I need to heat a room?

A very simple method for determining how much total heating wattage you need can be found by calculating the square footage of the room, then multiplying this by 10 watts to produce a baseline wattage requirement. For example, if you are heating a 12-foot x 12-foot bedroom, it will have 144 square feet.

## How many watts of power would it take to heat 1l of water?

24 calorie per second. It takes 1000 calories to raise 1 liter of water one degree C. So apply about 4000 watts for one second to do this.

## Do all kettles boil to the same temperature?

Answer: Kettles do not heat water uniformly. Put simply, kettles heat water at different temperatures in different places. Water around the heating element will be far hotter than water near the surface. You are therefore seeing some of the water boiling, but not all of it.

## Does boiling the kettle use a lot of electricity?

Kettle: around 2p to boil a full kettle: The average kettle holds 1.5 litres of water and uses about 0.1 kWh of electricity to boil for 3 minutes. That’s around 2p every time you boil a full kettle. … Your iron probably uses around 0.6 units of electricity (or around 10p) for every hour you use it.

## Which uses more electricity kettle or microwave?

The kettle is more efficient. … Microwave ovens at the other hand usually have a 60-65% power efficiency just for microwave generation. So if both electrical appliances have a same power, the kettle will be faster and cheaper in energy.

## What uses the most electricity?

What Uses the Most Energy in Your Home?

- Cooling and heating: 47% of energy use.
- Water heater: 14% of energy use.
- Washer and dryer: 13% of energy use.
- Lighting: 12% of energy use.
- Refrigerator: 4% of energy use.
- Electric oven: 3-4% of energy use.
- TV, DVD, cable box: 3% of energy use.
- Dishwasher: 2% of energy use.

14 нояб. 2016 г.

## Is it cheaper to boil a kettle or run the hot tap?

Is it more economical to boil water in a kettle or on a gas hob? If you’re heating your house then using a gas hob to boil a kettle is always going to be much more economical. The waste heat just goes towards contributing to home heating at 100% efficiency, and of course gas is much cheaper than electricity anyway.

## Why is energy needed to boil water?

1 Answer. Boiling water is an endothermic process, which supplies heat to the water molecules, increasing their potential energy. The applied heat causes the water molecules to move further away from each other without causing any increase in overall temperature.