We are getting our oil fired boiler replaced lo.ng at Buderus, Biasi, etc and will have it plumbed with a zone for indirect HW, which we were planning to add when we saved a bit more money. Have new electric that is working OK for the short term However we have an opportunity to buy a still on the pallet, never installed year old Vaughn Top Performer Plus for about half the regular .Water Heater Reviews and Buying Guide updated . Expert water heater reviews of the gas, electric and solar powered tankless and tanks, including hybrids, heat pumps and boilers, and used for heating potable water, at home, RV or in marine applications..Water heating is a heat transfer process that uses an energy source to heat water above its initial temperature. Typical domestic uses of water include co.ng, cleaning, bathing, ande heating. In industry, water and water heated to steam have many uses Domesti.y, water is traditionally heated in vessels known as water heaters, ke.es, cauldrons, pots, or coppers..Traditional water heaters all work in a similar fashion. The primary difference between them is the fuel source, such as gas, electric or even solar energy. To understand how your unit works, the first step is to become familiar with the components of your system, and how they interact. Components of a Water Heater Electric and gas water heaters have a number of components in common, including .