Variable frequency constant voltage 100W-500W + variable frequency constant voltage Variable frequency constant voltage 100W-950W + variable frequency constant voltage (2021 digital display new model) 300W (1-2) floor + antifreeze upgrade (2021 digital display new model) 400W (2-3) floor + antifreeze upgrade (2021 digital display new model) 500W (3-4) building + antifreeze upgrade (2021 digital display new model) 600W (4-5) floor + antifreeze upgrade (2021 digital display new model) 700W (5-6) floor + Antifreeze upgrade (2021 digital display new model) 800W (6-7) floor + antifreeze upgrade (2021 digital display new model) 950W (7-9) floor + antifreeze upgrade 2020 smart model 300W (1-2) building + water shortage protection 2020 smart model 400W (2-3) building + water shortage protection 2020 smart model 500W (3-4) building + water shortage protection 2020 smart model 600W (4-5) building + water shortage protection 2020 smart model 700W (5-6) building + Water shortage protection 2020 smart model 800W (6-7) building + water shortage protection 2020 smart model 950W (7-9) building + water shortage protection 2020 smart model 1100W (8-10) building + water shortage protection 2020 smart model 1500W (9-12) building + water shortage protection 2020 smart model 1800W (10-14) building + water shortage protection Variable frequency constant pressure 100W-950W + frequency conversion constant voltage
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