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These are just 2 of 29+ products we evaluate in Heat Pump Water Heaters. Take our 60-second quiz to get a personalized recommendation across all of them.
Take the full quizKey differences: 6699 vs GM Genuine Parts 251
Choosing between the 6699 and the GM Genuine Parts 251-817 comes down to what matters most to you in a heat pump water heaters. Different water heating systems serve different purposes. The 6699 leans toward tankless water heater kit, while the GM Genuine Parts 251-817 offers other.
Energy-saving features in water heaters can significantly reduce electricity consumption, leading to lower utility bills. The 6699 leans toward yes, energy-saving is important, while the GM Genuine Parts 251-817 offers no preference.
Ease of installation can save time and money, especially if you plan to install the system yourself. The 6699 leans toward yes, i prefer easy installation, while the GM Genuine Parts 251-817 offers no preference.
The 6699 stands out for users who value heat pump water heater and 50 gallons and yes, energy-saving is important. Meanwhile, the GM Genuine Parts 251-817 is the stronger pick if heat pump water heater and 50 gallons and no preference are your top priorities.
Rather than declaring an absolute winner, we recommend using the interactive comparison above — your priorities determine which product scores higher.