For the last couple of years Cindy and I have been using a Water Boy to water our large collection of indoor hibiscus and other plants. We are busy and before we got the Water Boy found that watering our plants was taking too long and would sometimes be ignored longer than was good for the plants. That was when we discovered the Water Boy and decided to give it a try.
Water Boy was invented to allow people whose job it is to take care of plants in commercial buildings an easy and fast way to water them. They are rugged machines that do exactly what they are meant to do and we expect ours to last for years. Ours holds 26 gallons of water under pressure, and lets us add fertilizer when we fill the machine using a normal hose out on the deck. We can water all our plants twice before refilling the machine, as compared to filling a 2 gallon watering can 6 times every time we needed to water.
We highly recommend these watering devices to anyone who has enough plants to make it worthwhile. Here is a link to photos and more info
http://www.chemsupplycompany.com/waterboy.htmCharlie