A showerloop is a shower system that reuses the drain water by filtering it with three mechanical, one chemical and one physical step.

See https://showerloop.org/ for the original project description.

As the Wupphaus will have multiple showers that will be used by many people, it does make a lot of sense to install such a system there.

Design goals

Usable for multiple showers at the same time, also a group shower
Support for multiple showers with different temperatures (no lose of comfort in respect to a normal shower)
Ability to shower cold without destroying the mechanism
Minimize energy consumption and water consumption in a resource and cost efficient way

Some numbers

A very resource saving person uses approximately 10 liters of water for a shower, a normal person 35. Some people tend to take a 20 minutes shower which will be 120-200 liters.

The average warm showering temperature is 35 degrees, meaning it takes approximately 0.029 kWh to heat one liter of water.

1kg of dry firewood provides approximately 4 kWh, better 3 kWh if you include the heating system and storage efficiency.

A typical warm water pipe - 1/2" steel - contains 0.2 liters per meter, a typical installation may have 5-30 meters of piping from the water storage to the shower. The energy loss in this case is not the shower temperature but the hot water temperature of the heating system (as the cold water in the pipe is drained in the beginning and the pipe is left with hot water in the end)

Shower type	water usage	water cost	energy usage	energy cost (wood)	energy cost (electrical)	energy cost (gas)	heating time central wood heater 50 kW
saver, cold	10	0.05€	0	0	0	0	0
saver, warm	10	0.05€	0.29 kWh	97 grams	0.08€	0.02€	21 seconds
normal	35	0.16€	1.02 kWh	333 grams	0.27€	0.05€	1:15 minutes
extended	100	0.45€	2.9 kWh	966 grams	0.78€	0.16€	3:30 minutes
super extended	200	0.90€	5.8 kWh	1933 grams	1.56€	0.31€	7 minutes
pipe loss - 5m	1	0.01€	0.05 kWh	10 grams	0.01€	0.00€	2 seconds
pipe loss - 20m	4	0.02€	0.19 kWh	60 grams	0.05€	0.01€	13 seconds

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