While I have an engineering background, I didn't think this question was all that unreasonable, but have not been able to get the answer I want
We're shortly building a new house in suburbia (in SA) and of course a rainwater tank is mandatory.
99% of rainwater tanks seem to be using the Davey "Rainbank" system to automatically switch between the rainwater tank (if available) or the mains water when rainwater is not in the tank.
The system will be plumbed into the house for toilet and washing machine use.
A new toilet uses around 6 litres / flush.
So, there is water pressure (stored) between the pump and the toilet float valve, monitored by a pressure switch.
Flushing the toilet releases the pressure, the pressure switch sees the drop and commands the pump to run until the pressure recovers, caused by the toilet valve closing.
OK...... flush the toilet, pump runs, pumps six litres, pump stops, repeat many times a day.
Davey also sells various size accumulators, "Pressure tanks".
I phoned up one of the largest rainwater tank / Davey pump suppliers in SA and outlined everything above and said ..................
"Can I just put a large, or a couple of smaller, accumulators in the system so that the pump doesn't stop-start so often."
Theoretically (discounting losses) if I put say a 60 litre accumulator in the system, and the toilet is 6 litres, the pump should only run every 10 flushes.
The rainwater dude thought this was a great idea, but didn't know if it could be done, and suggested I contact Davey Customer Service.
I was like......."Hey, every new house in SA (Australia ??) has this issue and I'm the first to ask this question....WTF ??"
So, I rang Davey Customer service.
They too had never heard of something this revolutionary
The dude there went and asked his mate and came back with "No, Not possible".
WELL........THAT SOUNDS LIKE A CHALLENGE TO ME
I don't believe that "It can't be done".
Any thoughts ??