COP
electric heating and Heat Pump
In cold climates Synchro efficiency remains constant
Always
Electric Resistance Water Heater Vs Synchro
Comparison Chart
The water heater has an electrical resistance which, when new, is efficient at 0.8-0.9. After 2 years it collapses to 0.65. Synchro has a COP of 1.3 (even when it's -20°C outside).
The black curve features the performance of the most sophisticated water heater on the market. The blue curve shows the performance of a normal medium value water heater. In 2-3 years the electrical resistance inside the water heater becomes encrusted and loses all effectiveness
The Water Heater IS NOT EFFICIENT
Synchro YES, its efficiency remains constant, ALWAYS