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Photo: Navien 
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Navien · Model NPE-180S2
NPE-180S2
Compact unit that vents with inexpensive PVC — great for retrofits.
Specs & features
- 8 GPM flow rate
- Natural gas
- UEF 0.96
- 15-year manufacturer warranty
- Covered by A1 Lifetime Service membership
Best for: older homes
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