We've used a number of products from Grundfos in the Zero Energy House, in particular two high efficiency pumps. Grundfos have been very helpful in working with us to determine the most suitable pumps for our requirements.
Rain Water Pump
The rainwater pump moves water from the rainwater tank to where it is needed in the house. The pump needs to provide water for a range of needs at different flow speeds and pressures, ranging from filling toilets to running hose taps. We've used a variable-speed CME Booster pump from Grundfos that can use up to 60% less energy than comparable constant speed pumps.
We use a variable-speed PM2 solar circulator from Grundfos to move water around the solar water heating system. It provides the following benefits:
- Consumes up to 80% less energy than a comparable constant speed pump.
- Ensures the flow through the solar collectors is adjusted to the optimum flow rate, dependant on the solar radiation, allowing us to maximise the efficiency of the solar water heater.
In addition Grundfos also have recently released a range of very innovative sensors, called Grundfos Direct Sensors. These monitor flow by measuring vortices in the water. These sensors, in addition to being extremely accurate, allow us to measure temperature. With these sensors we will be able to determine exactly how much water we use, and where it all goes. We'll be publishing performance data from these sensors later in 2013.
You can learn more about the Grundfos products and their role in the Zero Energy House on the water page.