Premier 1 vs K&H for Extreme Cold – -20°F Truth
Below -10°F, Premier 1. Above 0°F, K&H fine.
Premier: insulated lid, recessed nipples, -20°F rating, fill-while-hanging. K&H: 60W can't overcome wind + open exposure at -15°F – needs sheltered coop.
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If Vermont/Minnesota/North Dakota: Premier. If Ohio/Maryland: K&H saves money.
Cold-housing source
Sub-zero holds need insulation + shelter, not watts alone: UMN, Premier 1 waterers.