kiplette wrote: ↑Thu May 09, 2024 7:01 pm
[..]we used to use watering cans to collect the cold water flowing until the warm came through, but have got a bit lazy about that.[..]
Ok, let's look at this from a technical standpoint:
Let's assume a guy takes a shower every morning before going to work, and he has to let the water run for 2 minutes before it gets warm.
Once the guy is done showering, he shuts off the tap (and there is hot water left in the tubes in the wall!). This hot water turns into cold water over the next few hours.
The next morning, he has to let the water run for 2 minutes again before warm water comes out of the tap...
Do you see the problem? Those "2 minutes" of cold water used to be warm water...
The "2 minutes" of cold water every morning, caught in a bucket to save water costs, is not the actual cost factor. The actual cost factor is the fact that those "2 minutes" of cold water used to be hot water 24h ago, heated with
your money.
The pipe diameters towards showers were overengineered in the past (when the energy costs were not such a problem), but this kicks in the butt nowadays (considering today's energy prices).