Hello again from the UK
In preparation for our next (cold?) winter I'm finally hooking our boat's multifuel stove up to provide heat to 2 small radiators and using any excess heat to warm our domestic hot water tank. We live on board all year round.
I've just ordered the back boiler for the stove and have identified a 24 volt Johnson circulating pump. This pump will move 15 litres a minute but this is way too much to allow proper heat transferance. What I'd like to do is this...
I'd like to make the pump speed variable. I know I can do this with a manual pwm controller, but I need something more automatic. If we leave the boat for any length of time when the stove is lit, the stove temperature will vary. Likewise, while we're in bed the stove temperature will drop overnight.
I'd like to optimise all this by fitting some sort of thermostatic controller to the pipe carrying hot water away from the stove that will vary the speed of the pump to suit the heat of the water leaving the stove. The benefit of this is that the system water should not boil and pump noise will be reduced to a minimum.
The pump itself is this one
http://www.asap-supplies.com/johnson-fresh-water-circulating-pump-209614
Can anyone suggest either a suitable circuit (or even a suitable ready made product) that will make this possible?
Many thanks as always, Stu
In preparation for our next (cold?) winter I'm finally hooking our boat's multifuel stove up to provide heat to 2 small radiators and using any excess heat to warm our domestic hot water tank. We live on board all year round.
I've just ordered the back boiler for the stove and have identified a 24 volt Johnson circulating pump. This pump will move 15 litres a minute but this is way too much to allow proper heat transferance. What I'd like to do is this...
I'd like to make the pump speed variable. I know I can do this with a manual pwm controller, but I need something more automatic. If we leave the boat for any length of time when the stove is lit, the stove temperature will vary. Likewise, while we're in bed the stove temperature will drop overnight.
I'd like to optimise all this by fitting some sort of thermostatic controller to the pipe carrying hot water away from the stove that will vary the speed of the pump to suit the heat of the water leaving the stove. The benefit of this is that the system water should not boil and pump noise will be reduced to a minimum.
The pump itself is this one
http://www.asap-supplies.com/johnson-fresh-water-circulating-pump-209614
Can anyone suggest either a suitable circuit (or even a suitable ready made product) that will make this possible?
Many thanks as always, Stu