From the camp site to the barn, from the story ranch to the story mini mansion, EZ Tankless has a water heater for you..Find the gas or electric water heater for your home and lifestyle. Shop from instant on, energy efficient, tankless water heaters to traditional tanks..Gas Powered Tankless Water Heaters. Gas powered systems are fuelled by propane or natural gas and heat the water with a burner. A tankless gas water heater needs a gas line to the water heater, and the unit must be vented to the outside..Installing a solar water heating system is your best bet. It’ll likely pay for itself in as li.e as seven years, and after that your water will be essentially free..