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Dual Heat Exchangers A cast-iron primary exchanger provides reliable heat and peace of mind with its tremendous durability. The secondary exchanger is made from stainless steel to resist the corroding effect of condensation. Multi-Pass Efficiency The GV90+ features multi-pass designs for both heat exchangers. A five pass primary exchanger and two pass secondary exchanger improve the heat transfer surface area of the boiler improving system efficiency and comfort. Dual Circulators
- 91% AFUE efficient
- Durable cast iron primary heat exchanger
- Condensing stainless steel secondary heat exchanger
- Unique 7 pass heat exchanger design maximizes heat transfer
- Vents with PVC
- Multiple ventilation options direct vent direct exhaust concentric
- Easy conversion to propane kit included