Water Heaters, Filters & Softeners

Water Heater/ Geyser Buying Guide

If you are in the market for a new water heater, be aware that your options now reach far beyond replacing your current storage tank water heater with one just like it. Because heating water typically consumes from 15 to 25 percent of a home's total monthly energy budget, you'll discover that the best new water heaters focus on heating water efficiently.


To decide on the capacity, one needs to take into account the hot water requirement into consideration. It also depends on the application, usage / bathing pattern and number of users.

WATER HEATER TYPES - Based on storage

There are three common types of water heaters used in homes: storage water heaters, tankless on-demand water heaters, and instant hot-water dispensers.

Storage water heaters(Geysers)

Storage water heaters are the familiar tall, cylindrical white tanks. They utilize natural gas, electricity, propane, or fuel oil to heat water, and store from 20 to 80 gallons, depending upon the size of the tank.

You need to decide whether to buy a gas or electric model. On the average, water heaters last for 13 years, so one that operates efficiently can pay you back in energy savings over time. Also, check the first hour rating (FHR) number--this indicates how much hot water the heater can supply per hour at peak usage. The minimum FHR to select for your home will depend upon the number of bathrooms and bedrooms it has.

Another label on the water heater should reveal its energy factor (EF). This indicates how well the unit converts its fuel to heat. The higher the EF number, the more efficiently the water heater uses its energy. Although electric units may use their fuel more efficiently, electricity is a much more expensive water-heating fuel than gas.

Tankless water heaters

Tankless water heaters heat water without storing it.


Instant hot water dispensers

Instant Hot Water Dispenser

Instant hot water dispensers, designed to deliver small amounts of hot water, are typically located at the kitchen sink.


Electric Water Heater

These are primarily of 2 types of electric water heaters:

Electric Instant Water Heater

These are good for kitchens or in bathrooms where the tempature does not vary significantly during the course of the year . The hot water flow-rate from these water heaters is limited and thus these are not ideal for showers.

Electric Storage Water Heater

These come in vertical (wall mounting and floor standing) and horizontal configurations. Horizontal water heaters are more suitable for installation where the height of the celing is low or the installation is required in the loft.


Gas Water Heater

Gas Water Heater



Solar Water Heater

Some Solar Water heaters also come with an option of electric or electric heating as backup that can be used on cloudy days.

Solar Water Heater



Also see Solar Water Heater Buying Guide


You should consider the following materials for inner containers.

Stainless Steel



  • Copper is a good conductor and hence can get heated faster if the water is heated indirectly.(Check the heating elements section below)


    PUF or Glass wool Insulation

    PUF is better than glass wool as it retains the temperature of water for a longer period of time, eventually saving 40% energy. This results in higher cost savings also.

    Polyproplyene Body

    Polypropylene body prevents corrosion leaving no room for rust ensuring its longer life.

    Metallic Body

    Metallic body painted with a powder coating process is superior to the liquid painting process, as it generates a better layer thickness and is longer lasting .


    Thermostat: An externally adjustable capillary thermostat or stem type thermostats are usually provided.
    Thermal Cut Out: An additional thermal cut-out is provided as a back-up safety measure. It restarts only on pressing the reset knob.
    Pressure Release Valve: It is fitted on the inlet pipe to release any excess pressure.
    Fusible Plug: In a rare event of thermostat / cut-out or Pressure Release Valve failure, it springs into action.


    There are two types of heating elements used in water heaters. Indirect heating element take a longer time to heat as they do not come in direct contact with water,therefore they are less energy efficient. Tubular heating elements, on the other hand, heat the water through direct contact and are therefore more energy efficient, given the same wattage

    Copper as a heating element is good since it is a good conductor of heat and hence heats water faster.

    Also read,

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