Dimengineer, these are figures for country homes in Italy, where kettles are unheard of, heating is by wood, and computers are still the stuff of sci-fi films. And electric coffee machines..? Do domestic ones even exist? Most people unplug their fridges for the winter.

My fridge used 160-ish kwh last year, which is a lot less than 1kwh/day. My lighting circuit used 36kwh the year before last (for the full year.) Now it's zero.

Most people in my area have a supply of 3kW - ie their main supply meter trips if they use more than this at any one moment. I pay more to have a 6kW supply and I made a big effort to import a kettle that uses less than 3kW - as I use gas for the cooker I might still switch to the traditional system of a whistle kettle but it does tend to take rather longer to boil.

Most people around here have 3kw supplies. It doesn't mean they try to use it to the limit.

Still, from your last post I'm puzzled as to what you're doing on a green forum. You imported an electric kettle (presumably from the UK) because you couldn't wait the extra few seconds it takes to boil water like an Italian?

Its a physical fact that the amount of energy need to raise a given volume of water by a given number of degrees is a constant - I guess electricity is more efficient (100% to heat) and little leakage relative to gas to outside environment. Both gas (mine is bottled) and electricity are fossil fuels so we are just left with the losses at the power station etc - a long argument for little gain but this is not the point. I imported the kettle at the same time as I imported myself and all my house and family, and before I discovered this Forum. I am on this Forum now to learn, develop, change and to share.

Some more data: a 2.3kW plastic jug kettle (with flat base) required 102Wh to boil one cup, and a 3kW Tefal QuickCup hot water dispenser required only 28Wh for the same amount of water.

However, the water in the cup ended up 10 degrees C lower using the quick-cup machine. It was on the edge of being acceptable for a cup of tea. OTOH drinking scalding hot tea is pretty bad for you.

Gotanewlife asked on June 14th
So, anyone with an energy monitor and an 'old fashioned' constant power pump, pressure switch and large accumulator want to compare energy usage and water usage for a week or 2.

I managed to put a water meter in and the pressure vessel (accumulator) is about 100lts

Results from water pumping and power monitoring as requested.

Pump type Pentax PM 80. (made in Italy)
Pump specs
Voltage 230 Volts, Power 740W
Max height 61M Max suction 6M
Max output 3 M³/ hour
Optimum working point 3.1 M lift giving 2.4 M³ / hour

Specification KWH / M³ 0.308
Price 89.5 Euro or 73.7 GBP inc. VAT (in Hungary)

Results of monitoring
Period - 1 week
Operating pressures - Switch on 2.1 bar, Switch off 3.2 bar
Quantity pumped - 12.45 M³
Power consumed – 5.69 KWH

KWH / M³ – 0.457

I suspect the difference between the rated KWH / M³ and the observed is that the rated would be continuous flow whereas in use there is stop/start with some cavitation on start up plus inrush current both of which will detract from performance. Plus of course the pump is 4 years old so some wear may have taken place.

If a greater output is needed then 2 pumps could be put in parallel, for greater pressure 2 pumps in series. In my case I have 2 in series to get sufficient lift for the high pastures. The pump measured serves, via a pressure vessel, domestic water and the lower part of the farm. (The second in series pump, with its pressure vessel, is teed off the supply pipe like another tap) The water used represents domestic water and animals since we had more than enough rain (very unusual) to cater for the kitchen garden.
Putting 2 of these pumps in series was considerably cheaper than getting 1 pump with sufficient lift to manage the requirements in addition there is some options available in the event of a pump failure.
Peter