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## timmmay

19624 posts

Uber Geek

Trusted

#812457 7-May-2013 06:16

Is it still cheaper when the daily charge for has gas is taken into account? Perhaps if you're just heating water, and if you're heating water and cooking. If you can heat your house without adding water (ie it's not burned inside) then it may be even more worthwhile.

## MightyApe

You will find anything you want at MightyApe (affiliate link).

## rayonline

1730 posts

Uber Geek

#812691 7-May-2013 11:46

I am wondering if the kW it is spitting out is actually correct? A family of 4 here where they cook lunch and dinner every day and we use 1200kW for a month. Sure, if you add this onto the electricity it would be a lot more but seriosuly how many 4 member households spend \$450+ for elecctricty + electric water and heating....

Would it be too much to ask if anyone could do a shower test for me and note the difference in your gas meter so I can get an indicator? Like before and after the shower and the multiplyer your bill uses inorder to convert it to a kW figure.

For us here, it's 4.11kW for a ~12min shower.

## wongtop

545 posts

Ultimate Geek

#812704 7-May-2013 12:03

I think your 4 kWh or 28c for a 12 minute shower is reasonable.

From first principles say 15/l per min for 12 min = 180 l.

Say you are heating up the water by 20C (e.g. from 17C cold to 37C for the shower), the specific heat of water is 4.1 kJ/K/l so to heat that water is 180 x 20 x 4.1 = 14760 kJ.

There are 3600 kJ in a kWh so that is 14760/3600 = 4.1 kWh.

The real mystery is why you are using \$1 of gas in meal prep. This would amount to about 16 kWh. This seems an unusually high amount - are you rinsing using hot water a lot or using a wok burner for long periods of time?

According to consumer here cooking is typically 7% of consumption.  The average house uses around 24 kWh per day so cooking should only be around 2 kWh per day for typical households - which would be around 14c on your rates if my maths is right.

## rayonline

1730 posts

Uber Geek

#812751 7-May-2013 12:58

So what do people cook with 2kW .. lol.

That day was lunch and dinner preparation.
Lunch might have been a pot of hot water from the tap for some rice noodles and maybe a 2nd pot just to heat up some soup from the prev day. Hot water for dishwashing and table wipe down.

Dinner was one the larger burner to heat some water to steam some food and another cook up a casserole (the smaller burner) and a third burner to heat up some prev soup. Dishwashing and wipe down.

Will do a monitor today and get back again ...

## rayonline

1730 posts

Uber Geek

#813171 7-May-2013 19:25

Reporting back ...

Yesterday yah - we used 23kW from preparing dinner to about midnight when I took the readings.

Today:
Dinner prep - 5kW
Dinner dishes/cleaning - 3kW
1 shower so far - 3kW
3 more showers later - 9kW

Total of 20kW. The diff of 3kW could just be diff cooking style or diff shower lengths / cleaning ...

## Aredwood

3885 posts

Uber Geek

#813335 7-May-2013 22:28

timmmay: Is it still cheaper when the daily charge for has gas is taken into account? Perhaps if you're just heating water, and if you're heating water and cooking. If you can heat your house without adding water (ie it's not burned inside) then it may be even more worthwhile.

There will be a cutoff point where electricity will be cheaper than gas. But this will only apply to very low users. (no point having just a gas hob and no other gas appliances). But the OP is definitely better off using gas than electricity for their hot water and cooking.

Rayonline - What do you use for heating?

## rayonline

1730 posts

Uber Geek

#813351 7-May-2013 22:48

Heat pump and the rooms have oil fin heaters. House does have two gas heater one in lounge and one at front door and some gas taps on the carpet - prev owner but we dont use them.

## timmmay

19624 posts

Uber Geek

Trusted

#813450 8-May-2013 08:03

Burning gas produces CO2 and water as by-products. You need good ventilation if you're burning gas inside.

My Mum used to think gas dried the air out, so we always had a dish of water in front of the gas fire when we were little. She had it completely backward!

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