Hot air rises. And so do hot exhaust gases from a water heater. But if an exhaust vent slopes downward, as this one does, exhaust fumes containing poisonous carbon monoxide could leak into the ...

Rinnai RX199iN Condensing Smart Sense Tankless Water Heater Rinnai RX130iN Condensing Smart Sense Tankless Water Heater Bottom Line: If you have moderate usage demands and budget is a priority, this 7 ...