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A central, whole-house, gas tankless water heater can cost $800-$3,000 or more, without installation. Because tankless systems typically require the addition of a 220V/240V outlet and/or larger-diameter gas pipes than found in an average home, installation can bring the total cost to $1,800-$5,000 or more. How much does a tankless water heater cost? Tankless water heaters are typically more expensive to install than standard water heaters. The cost difference is due to.

If the water heater is not connected to a boiler, it is free standing, has a Pressure/Temperature releif valve, the main inlet water line to the entire house has a water pressure control valve and there isn't any exisiting/current problems, no expansion tank should be needed. In my opinion and based upon my vast number of years of experiences as an appliance serivce tech, no expansion tank should be needed for a non interconnected free standing gas water heater. Wild Thornberrys Wildlife Rescue Game. Check back on your question several more times. Other members and the plumbing professionals posting replies in this forum topic may offer you additional advice. Web Site Host, Gas Appliances Topic Moderator & Multiple Forums Moderator.