I got mine at a Leftponian Wal-Mart for maybe $5. Paid for itself in draining the radiators and pipes: hook up to mains, suck and eject the mix of CH water and tap water into the bathtub drain. It will eventually suck all the low spots empty.
Also used here, (though there I used a better metal injector pump):
Thomas Prufer
Is an 'injector pump' essentially a venturi?
Exactly that. Names I also found: eductor-jet pump, injector/ejector, filter pump, Venturi pump, water aspirator pump.
Thomas Prufer
How “small” is this washbasin? Some of the condensate pumps designed for commercial installations have a reasonable flow and a tank capacity of 4l to 5l . You need to look around the ones available for Air con systems not the titchy ones used for a domestic boiler.
GH
There's also a whole slew of "submarine toilet" drain systems.
Lots of these drain into a tank, and use compressed air and a set of valves to empty the tank, usually to the outside, and usually with no chance of water entering through the hull.
Failure to sequence the valves right reportedly leads to spectacular failures.
Thomas Prufer
Have something to add? Share your thoughts — no account required.
Ask the community — no account required