An On Demand Water Heater would be great if you're looking for a reliable heater. On demand water heaters are efficient, and they come in different sizes. A good heater is certainly necessary, especially if you live in a cold climate. There are many different kinds of heater on the market such as baseboard heaters, air heaters, floor heaters, propane heaters, outdoor heaters and more, so no matter what your space looks like, you're sure to find something that will fit your home perfectly. 
EcoSense by Rheem 7.4 GPM Tankless Water Heater Natural Gas
"The Eco Sense by Rheem PTG-74PVN Natural gas "Whole Home" tankless water heater provides continuous hot water for your family for up to 20 years or more. The 199,900 BTU burner provides hot water at 7.4 GPM allowing two to three major applications such as two showers and one sink to be used at the same time. Save up to 30% on fuel cost compared to a standard gas water heater or up to 70% compared to a standard electric water heater." 
Ariston 4.0 Gallon Point of Use Electric Water Heater
"Ariston 4.0 gallon mini-tank is easy to install, fits under a sink and can mount on the wall or floor. Perfect for commercial or residential uses. Comes with a 6-year warranty."
These heaters can be found at homedepot.com
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