Check Price: Rinnai RX130iN Condensing Smart Sense Tankless Water Heater Bottom Line: This tankless water heater is non-condensing and can fit in various spaces. Pros: This highly energy-efficient ...

That technology is 25% more efficient than a tank water heater and lasts twice as long." Rinnai makes a non-condensing tankless water heater, making it less efficient than the condensing version ...