my previous water heater with built-in pump  was Alpha,  i satisfied with it. It last for 6 yrs

The new unit is BeeBest, as recommended by the shopkeeper, the most silent pump in the market, but the price almost the highest
unit = RM560
installation = rm70
shop = Tan Boon Meng

However, i really disappointed with their installation workmanship
Their task is install and go, they dont care how the layout...piping bend here and there...