We live in a relocatable home and currently have lpg gas this has been costing us $25 per fortnight hot water and very little use of cooking stove, there is only the two of us, do you have instantanious heaters? open to sugestions.
Unless your water heater has a horrendous latent heat loss, the cost of heating the water should be the same whether it is heated and stored or heated as needed. Also, a tankless heater has a finite flow range. With just the two of you, you should not exceed the maximum gpm, which is usually about 6 gallons, but it will also not heat water if the flow is less than 1/2 gpm such as a gentle rinse application.
Interesting reading above. European hot water heaters are rated at minimum 20kWatts (80,000 BTU)with flow rate of 9 Liters per minute (say 2 gallons per minute) for temperature rise of 35 degrees Centigrade. To achieve a flow rate of 6 gallons per minute the heater will be fairly large for an instanteous water heater.