Alternative Technology Assn Forums

1. 

   Huski
   Member

   Does anyone know an efficient pump I can get for my water tanks to use for toilets that doesn't use any standby power.

   Posted Saturday 13 Jul 2013 @ 9:36:53 am from IP #
2. 

   murry
   Member

   Yup.. Pretty much any domestic house pressure pump with a mechanical pressure switch- eg. a
   "Square D" type pressure switch -together with a (say 20 litre) pressure tank will do.
   Pump will only come on when the pressure tank drops to below the pressure switch setting at
   which time the pressure switch closes the contacts to start the pump motor.
   Got one under my floor- 30 years old and good for another 30.

   Posted Saturday 13 Jul 2013 @ 10:51:01 am from IP #
3. 

   dlvb19
   Member

   I have a Grundfos CMB-34 which sounds similar to what Murry is describing. Uses 1.8W on standby. This amounts to about 16kWh per year or less than $4 at current prices (35c/14c). If you want ZERO standby you will probably have to set up a header tank with a solar pump. Economically speaking this is a foolish route to go.

   Why do you require zero standby?

   Posted Sunday 14 Jul 2013 @ 3:22:51 am from IP #
4. 

   Morbo
   Member

   pressure switch is just a relay, powered by the pressure. So its 0W when off. Measured just then. Grundfos something with 9L bladder. 0W when off, 540 when on, 0.0015kWh for 1 cycle.

   Posted Sunday 14 Jul 2013 @ 6:08:22 am from IP #

RSS feed for this topic