Guest
It taks some time for the pump to heet up the water tank, but tha boiler ony needs to heet water up to the water tank tempurtur so it turns on an off wen the pump sends water throug the heatchangr. The water temurtur is high so the water pumped from the botum of the boiler boils inside the cirulatur making noises. Yu need to set the water tempurtur lower for the boiler water so the water wont boil in the ciculatur. Wen the boiler cool down it sucks air in the pips an yuo have to bleed it.
