If I want to buy 24 hour allergy meds and I am only allowed 9 grams a month and 1 box is 240mgs how many can I buy per month. Thanks anyway

gas input is 20 grams / hour
a full 4.5 kg bottle has 4500 grams of gas so calculations indicate that it should last for 225 hours or to be safe at least 200 hours or 8 days if it is on a caravan , a better proposition would be a 9 kg bottle

MG = milligram = 1/1000 of the gram

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I cannot find a manual for the Darlac DW253.
It appears the timer is set by moving each selector knob.
http://www.watermate.co.uk/secure/uploads/DW253%20(Small)%20new%20darlac%20pop.jpg

Knob on right is Run Time:
This is how many minutes timer will run each time.
Set run time from 1 minute to 120 minutes.
Knob on right also has ON-OFF override.

Knob on left is Frequency:
This is how frequently the timer will turn ON. Once per hour, once per each 2 hours ... once per 24 hours ... once per 72 hour ... once per week.

So set frequency to 48 and set run time to 20, then every 48 hours the water will turn on for 20 minutes.
To turn timer off, move right knob to OFF.
For continuous watering, turn same knob to ON.

This timer is battery-powered, probably 9 Volt, but maybe AA.
Battery carriage appears to be located on front below the function knobs.
Typically, water timer batteries last one season.

Timer can be connected to household spigot, or connected to any passive water supply for example rain barrel or tank.
Appears to have standard female hose thread on top, or possibly 1/2 pipe thread, and quick connection on bottom.

Plastic water timer exposed to freezing temperatures can crack. Drain water out of timer during cold weather.
Generally if water timer stops working: replace battery, clean battery terminals, and if functionality is not restored, then buy another timer.

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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.

Not sure if this will help... however an altmeter will allow you to test along your electrics for any faults. You can check at the lights for example and throught the system.