I use around 7000 metric units of gas per year and need to convert this into Kwh so I can shop around. Any ideas?

Sorry but there is no current cost - it depends on your supplier and which tariff you are on. If you have a smart electricity meter you could even be paying different prices at different times of the day or days of the week.
Such is the current state of the market almost everyone in a single street could be paying different amounts for electricity.

You need to contact your supplier or look at your electricity bill to discover the cost per unit or kWh (kilowatt-hour). Your 1500 watt heater will consume 1.5 kWh or one and a half units every hour.

£479.49 is the same price whether your the quantity of gas in Imperial units or metric units
12.March.2015

You would need to look on the label inside the refrigerator door that indicates the power consumption for your model. You would then need to compare this with the new model to determine the potential savings in kWh/year. Once you know the potential yearly savings, you would need to multiply this number by your electricity cost (it should be available from your monthly bill, or you can call the utility). Then you can determine how long it will take to recover the expense of purchasing the new refrigerator (minus the rebate).

To be able to convert a unit into another, the two units must be compatible, ie they must represent the same physical quantity. The unit kWh reads kilowatt hour and is a unit of of energy. The liter, on the other hand is a unit of volume or capacity (dry measures). What is the link between the two: none. So you cannot convert energy into volume.
If the content of the volume is some kind of fuel that somehow generates energy and you want to know how much energy this volume of that particular fuel can deliver then there is not enough information to attempt a solution.
Sorry.

Metric Meter is not a relatable unit to tons. Cubic meter might be what you are looking for.
That being the case it depends on what you have 3 tons of, everything has a different density, meaning everything has a different weight(tons) per unit of volume(cubic meter) so first off you need to find out what material you are trying to figure this out for. Water for example weighs less per cubic meter than steel weighs per cubic meter. Then once you know that material you can then ask what is the density of that material. Once you find the density you can convert that information into any relative unit of measure you need, so re-post with a little more info and make sure you are looking for the right units and somebody can answer your question.
Sorry I couldn't be more help.

A figure of 385 Kw/h per year is listed. This is a very inexact figure and depends on many variables such your climate, position of the unit and the frequency with which it is opened. I would take it that the figure stated would be an average consumption and only useful as a guideline.

To determine the cost of using this air conditioner, you will need to find out what your electric company charges per kw/h. This is the standard unit that electricity is charged for. Next determine the wattage of the air conditioner. This should be found on the unit name plate. If you can not find the wattage by the name plate, the take the voltage and multiply by the amperage, this will give you watts. Next multiply the wattage by 24. (watts per hour x 24 hours) Finally divide this number by 1000. This will give you the total Kw that the unit will use in a 24 hour period. If you multiply this number by the cost per Kw that will give you the operating cost of your unit for one day.
ex. electric company charges .25/Kw The unit uses 1000 watts 1000 x 24 = 24000 watts 24000/1000 = 24 Kw 24 Kw x .25/Kw = $6.00 day
Note: all figures shown above were randomly generated in my head, and have no correlation to your calculations. Hope this helps.

KWH = The Wattage of the Unit multiplied by the length of time used.. IE: a 1000 Watt Unit that is used for One Hour is equal One Kilowatt Hour. (1000Watts = 1KWatt) Wattage is The input Voltage multiplied by the Current draw. IE: 115Volts the unit draws say 4Amps equals, 115x4=660 = 660Watts.

The GE TFF20VB 19.6 CF Frig is rated at an estimated average 1,438 Kwh/yr. The new one GE is almost twice as efficient. A annual energy savings of 68.289%. If you can afford to pay cash for the new one get the new one. Never finance or you will just be spending the savings in interest and finance charges and never actually realize the savings.