There is a contents gauge on the top of the tank. When the gauge reads 30%, you need to order.
If you have an online account, you can place an order for gas at www.mycalorgas.com
Contact Calor for the Republic of Ireland on 1850 812 450 or for Northern Ireland on 028 9045 5588 selecting option 1 on the menu (You will need your account number)
Please make sure to check the contents of the tank regularly and keep in mind that you need to allow up to 5 working days for the tank to be filled, from the time you place the order with us.