Build a solar hot water tank for that heated water and enjoy it the next morning too.
Diy thermal storage tank.
The answer is a thermal store.
The biggest advantage of diy water storage tank over commercial equipment is that you can expand the storage tank size without spending much money.
We have tanks from 120 gallons up to 5 000 gallons for large solar heating systems of wood boiler system.
Bigger is not always better but certainly better for tanks.
If you size your solar hot water also known as thermal storage tank correctly you can easily store the heated water overnight and it will be plenty hot enough to provide comfortable showers or clothes laundering water.