If you are much in to saving electricity in your home, then you can use many other energy options, other than electricity, to warm water in your water. Water heaters or geysers consume a lot of power while they are switched on thus your electricity bill also rises steeply. Instead of using conventional electricity, you can use solar energy to warm the water. You can simply install a solar panel on the top of your house and connect the water heater system with it thereby saving a lot of electric power and also lowering the electricity bills.
If you want lukewarm water, then you simple place the water on a flat bowl and place it under the sun for a considerable period. The water slowly gets warm after few hours. Here only the solar energy is consumed which comes for free. You can also use the solar cooker to heat the water. The solar cooker can really give much warm water to satisfy your needs.