PV Gap

Ronald Said:

what are the energy changes in solar hot water panels?

We Answered:

Perhaps you're thinking of the conversion of electromagnetic energy (light) into thermal energy. The energy of each photon is absorbed, and increases the kinetic energy of the water molecules.

Christine Said:

Solar hot water panels.?

We Answered:

All you have to do is search "solar hot water" on any search engine.
With passive solar hot water you are in luck with your wish of no electricity being used, because a vertical looped system will naturally circulate when water is heated at one end. Also as long as you have cold water coming in under pressure, moving up threw the PASSIVE (means no electricity - thermomass absorption of UV radiation) hot water panels - then to a storage (insulated) tank and or back up to the hot water panel, unless you call for it to wash dishes or shower. No electricity needed.
Building your own is easy and cheap enough, but the new manufactured vacuum tubes (no electricity either) are far more efficient at obtaining hot water from limited UV sources, plus the return on the investment is very short and pays for itself generally in less than 5 years, with an estimated life cycle of around 30 years, so it pays for itself 5 times over.