The GF 200 combi gas water heater/furnace from NTI has proprietary and exclusive software to minimize cycling with 10 stages of modulation for smooth heat output. An internal recirculation and buffer tank eliminates cold water sandwich and no minimum flow rate is required. It is field convertible to LP gas. Features include simultaneous DHW and heating up to 170 MBH (85 per cent burner capacity); automatic DHW priority above 170 MBH; stainless steel heat exchangers; and a negative pressure gas valve with pre-mix burner provides full modulation from 20-200 MBH.
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