2024 Guide to Choosing the Best Water Heater: Types, Features, and Energy
Saving Tips.

How to Select the Best Water Heater / Geyser: In-Depth Guide

Water Heater Buying Guide: Top Factors to Consider for Homeowners

Choosing the right water heater involves understanding the needs of your
household, your budget, and the heater’s compatibility with your energy
sources. Additionally, today’s market offers various options, from traditional
tank heaters to eco-friendly solar models, each with its own benefits and
drawbacks.

Types of Water Heaters

Understanding the types of water heaters is fundamental in making an informed
decision. Each type has unique features, costs, and energy usage. Here’s a
breakdown of the main options:

1. Immersion Rods

Overview:
Immersion rods are basic, portable
water-heating devices made for small quantities of water. They consist of a
metal rod with an attached electrical cord, and they work by submerging the
rod in water. Heat is generated when the rod is powered on, warming the water
directly.

Pros:

• Affordable and highly portable.
• Simple to use and easy to store.
• Ideal for small, occasional water heating needs.

Cons:

• Limited capacity (suitable for heating only small amounts of water).
• Requires constant supervision due to safety concerns.
• Not suitable for homes needing hot water in large quantities.

Best Use: Suitable for individual use or in areas where a
dedicated water heater may not be feasible.

2. Storage Water Heaters

Overview:
Storage water heaters are large tanks with
built-in insulation to store heated water until it’s needed. These are the
most common water heaters and come in various capacities, typically ranging
from 10 to 50 liters.

Pros:

• Reliable hot water supply for long showers and multiple uses.
• Available in a wide range of sizes to suit household needs.
• Energy-efficient due to insulated tanks, which retain heat longer.

Cons:

• Requires space for installation, making it unsuitable for small bathrooms.
• Consumes more electricity as it continuously keeps water heated.
• Takes time to reheat water once it runs out.

Best Use: Ideal for medium to large families where a
continuous hot water supply is necessary.

3. Instant (Tankless) Water Heaters

Overview:
Instant or tankless water heaters heat water
only when needed. When the hot water tap is turned on, cold water flows
through the heater, where it is quickly warmed before reaching the tap.

Pros:

• Energy-efficient since it heats water only on demand.
• Compact and space-saving, ideal for small bathrooms.
• Provides hot water almost instantly, eliminating the wait time.

Cons:

• Limited output suitable mainly for single points (e.g., kitchen or single
  shower).
• Higher upfront cost than storage heaters.
• Might struggle to supply hot water for multiple uses simultaneously.

Best Use: Perfect for individuals or small families needing
hot water in short bursts (like quick showers or hand washing).

4. Gas Water Heaters

Overview:
Gas water heaters use either natural gas or
LPG to heat water. They provide a continuous supply of hot water, which makes
them popular in regions where electricity supply might be unreliable.

Pros:

• Cost-effective to operate, especially in areas with affordable gas.
• Provides hot water even during power outages.
• Can deliver a continuous flow of hot water.

Cons:

• Installation requires proper ventilation to prevent gas buildup.
• Higher installation and maintenance costs.
• Safety risks related to gas leaks if not maintained properly.

Best Use: Ideal for areas with reliable gas connections and
for families needing continuous hot water without high electricity bills.

5. Solar Water Heaters

Each type of water heater has its benefits and limitations, and choosing the
right one depends on factors like household size, hot water requirements,
available space, and energy costs. This information can guide you in selecting
the water heater that best meets your specific needs.

How to Pick the Right Water Heater: Types, Pros & Cons, and Expert Tips

Factors to Consider When Selecting a Water Heater

1. Type of Water Heater

The first factor is deciding on the type of water heater that best fits your
needs. Options include storage tank heaters, tankless heaters, heat pump
heaters, solar heaters, and gas water heaters. Each has its benefits,
limitations, and energy efficiency characteristics. For example:

• Storage tank heaters are reliable but may have higher
  energy costs due to standby heat loss.
• Tankless heaters provide hot water on demand and are
  energy-efficient, though they may have higher upfront costs.
• Solar heaters are eco-friendly and cost-effective in sunny
  climates but have high installation costs.

Understanding the types will help you find a model that aligns with your
household’s hot water demand and energy consumption preferences.

2. Energy Source and Efficiency

Water heaters operate using electricity, gas, solar, or even propane,
depending on the model. Choosing the right energy source is important:

• Electric models are widely available and convenient but may
  result in higher utility bills.
• Natural gas or propane heaters can be more cost-effective
  in areas where gas is cheaper than electricity.
• Solar heaters are highly efficient and eco-friendly but
  rely on sunlight availability.

The energy efficiency of a water heater is also crucial.
Check the Uniform Energy Factor (UEF) rating, which measures
how efficiently a unit converts energy into hot water. Higher UEF ratings
indicate greater energy efficiency, helping reduce energy bills over time.

3. Capacity and Size

Water heater capacity is vital to ensure an adequate supply of hot water
without wasting energy. The correct size depends on:

• Household size: For a family, a larger tank (150-300 liters
  for storage heaters) may be necessary, while a smaller household can opt for
  lower capacities.
• Usage pattern: Homes with high hot water demand (showers,
  dishwashers, etc.) may need larger or higher-output systems like tankless or
  gas-powered models.

Tankless heaters are rated by flow rate (liters per minute),
so consider the number of fixtures you’ll need to run simultaneously.

4. Initial Cost vs. Long-Term Savings

The initial cost of water heaters varies widely by type and brand. While
storage tank heaters are generally affordable upfront, tankless and solar
models tend to have higher initial costs. However, the latter may lead to
long-term savings due to lower energy consumption and longer lifespans. Think
about:

• Upfront cost vs. energy savings: Consider the lifetime
  cost, including maintenance, energy savings, and expected operational life.
• Installation costs: Tankless and solar heaters, for
  example, might require specialized installation, which can add to initial
  costs.

5. Recovery Rate

The recovery rate indicates how quickly a water heater can
reheat water after the initial supply is depleted. This is particularly
important for households that use a lot of hot water within a short period.
Models with higher recovery rates are suitable for large households or heavy
usage, as they ensure the availability of hot water even after multiple uses.

6. Installation Requirements and Space

The installation space and requirements are essential, especially in smaller
homes or apartments. Some factors include:

• Space: Storage tanks need space for the tank, while
  tankless units are compact and can be wall-mounted.
• Ventilation: Gas heaters require proper ventilation, while
  electric heaters can typically be installed anywhere.
• Access to sunlight: Solar heaters need ample exposure to
  sunlight, often installed on rooftops, which may not be feasible in some
  setups.

7. Safety Features

Modern water heaters often come with safety features to prevent overheating,
scalding, and electrical hazards. Look for models with:

• Thermostatic controls: Prevents overheating and allows
  temperature adjustment.
• Automatic shut-off features: Shuts off the unit in case of
  overheating or other risks.
• Safety valves and pressure regulators: Important for gas
  and electric models to manage pressure buildup.

8. Warranty and Maintenance

Choose a model with a good warranty, as water heaters are long-term
investments. Warranties can range from 3 to 12 years depending on the type and
brand. Additionally:

• Maintenance requirements: Models like tank heaters require
  periodic flushing to prevent mineral buildup, while tankless heaters need
  less frequent maintenance.
• Replacement parts availability: For easy repairs and
  cost-effective maintenance, check for locally available parts or brand
  support.

9. Environmental Impact

For eco-conscious buyers, consider models that reduce environmental impact,
like solar or high-efficiency electric models.
Energy Star-certified water heaters, for example, are tested
for energy efficiency and help reduce carbon emissions and energy costs.

10. Noise Level

Certain models, particularly heat pumps, may produce noise during operation.
If the unit will be installed near living spaces, choose one with low noise
ratings or insulated features.

Selecting a water heater that meets these criteria will ensure that you make
an informed decision. By considering each of these factors, you can find a
model that fits your household needs, saves energy, and operates efficiently
within your budget.

Each factor contributes to your water heater’s performance,
cost-effectiveness, and durability, so carefully consider which aspects align
with your home’s needs.

How to Select the Perfect Water Heater for Your Family’s Needs and Budget

How to Choose the Right Size for a Water Heater

Choosing the right water heater size ensures you have enough hot water for
your household needs without wasting energy or incurring higher costs. Here’s
a guide to selecting the correct size, focusing on tank and tankless heaters:

1. Determine Your Household’s Hot Water Needs

Start by evaluating the average hot water demand, which varies by household
size and usage patterns. Consider the following common uses:

• Showers/Baths: Use roughly 20-30 liters per person.
• Dishwasher: Around 15-20 liters per load.
• Washing Machine: Uses 30-40 liters per load, depending on
  efficiency.
• Kitchen Use: Generally around 10-15 liters per use.

Calculating the maximum hot water demand helps to select a water heater that
can meet peak usage without running out.

2. For Storage Water Heaters: Selecting Tank Capacity

Storage water heaters come with tanks that store a set amount of hot water, so
choosing the right tank size is essential to prevent overuse or wastage. Here
are general guidelines based on household size:

• 1-2 people: 50-80 liters
• 3-4 people: 120-150 liters
• 5+ people: 200-300 liters

First-Hour Rating (FHR)

For optimal efficiency, check the First-Hour Rating (FHR) on
the heater’s label. FHR indicates the amount of hot water (in liters) a heater
can supply per hour when starting with a full tank. To ensure continuous hot
water, match the FHR to your peak hour usage.

3. For Tankless (Instant) Water Heaters: Flow Rate and Temperature
Rise

Tankless water heaters don’t store hot water but heat it on demand. Their
output is based on flow rate, measured in liters per minute
(LPM), and temperature rise, the difference between the
incoming cold water and the desired hot water temperature. For an effective
tankless water heater:

• Flow Rate: Determine the total LPM needed for
  simultaneous use. For example:

  • Shower: 6-9 LPM
  • Dishwasher: 4-6 LPM
  • Kitchen Faucet: 3-4 LPM

• Temperature Rise: Consider the climate and incoming water
  temperature. In colder climates, the heater requires more power to achieve
  the desired temperature rise.

A typical small household may need a tankless unit with a flow rate of 6-12
LPM, while larger families may require higher-capacity units or multiple units
to meet simultaneous demands.

4. Recovery Rate for Large Households

If you have a high demand for hot water, especially with back-to-back showers,
the recovery rate is crucial. It measures how quickly a water
heater can reheat water once the supply is depleted. Heaters with high
recovery rates (like gas-powered models) are ideal for large households where
hot water is used frequently in short time spans.

5. Consider Energy Efficiency and Usage Patterns

If hot water usage is spread throughout the day, a smaller, energy-efficient
unit with a higher recovery rate might suffice. However, if you have peak
usage hours, opting for a larger tanked or multiple tankless heaters may be
more suitable.

Sizing Guidelines

Here’s a simplified summary based on household size and heater type:

• For 1-2 People: 5 liters (tank), 6-9 LPM (tankless)
• For 3-4 People: 15-20 liters (tank), 9-12 LPM (tankless)
• For 5+ People: 25+ liters (tank), 12+ LPM or multiple units
  (tankless)

Choosing the right size water heater can help you balance energy costs with
hot water availability, ensuring that you meet your household’s needs without
unnecessary expenses.

6. Comparing Features of Water Heaters

Water heaters today come with various features that enhance usability,
efficiency, and convenience:

• Thermostats and Temperature Control: Some models include
  adjustable thermostats or digital controls for precise temperature
  settings.

• Self-Cleaning Mechanisms: These reduce mineral buildup,
  extending the heater’s life.

• Smart Technology Integration: Newer water heaters may
  offer Wi-Fi connectivity, allowing users to monitor and control the heater
  remotely.

Consider which features will add the most value based on your household’s hot
water needs and budget.

7. Installation Requirements and Costs

Proper installation is crucial for safety and efficiency, and costs vary based
on heater type and setup requirements.

• Storage Tank Heaters: Require adequate floor space and
  are typically easier and less expensive to install.

• Tankless Heaters: Require more complex installation,
  including venting for gas models and electrical upgrades for electric
  models.

• Solar Heaters: Need a dedicated space for solar
  collectors, often on a rooftop, and typically have higher installation
  costs.

• Installation Costs: DIY installation may reduce upfront
  costs, but professional installation is often safer and may be necessary
  to validate warranties.

Each heater has unique setup needs, so it’s essential to understand these
before purchase.

FAQs: Choosing and Using a Water Heater / Geyser

1. What is the difference between a water heater and a geyser?

A water heater and a geyser both heat water for household use, but the term
“geyser” is often used in some regions (like India) to refer specifically to
electric or gas-powered instant water heaters, whereas “water heater” can
refer to various types, including storage tank heaters, tankless heaters, and
solar heaters.

2. How do I know what size water heater/Geyser I need?

The right size depends on your household size and hot water usage. Small
households (1-2 people) may need a 50-80 liter tank, while larger families (4+
people) typically require 150 liters or more. For tankless systems, size is
based on the flow rate (in liters per minute) needed for simultaneous use.

3. Which type of water heater is the most energy-efficient?

Solar water heaters are the most energy-efficient as they use renewable energy
from the sun. Among electric options, tankless heaters generally save more
energy by heating water on demand rather than storing it.

4. How long does a water heater usually last?

On average, storage water heaters last around 8-12 years, while tankless
models can last up to 20 years with proper maintenance. Solar and heat pump
heaters may also last longer with regular care.

5. What is a thermostat, and why is it important in water heaters?

A thermostat controls the water temperature in a water heater. It’s important
because it prevents overheating, reduces energy consumption, and helps
maintain safe water temperatures, usually recommended at 50-60°C for household
use.

6. Can I install a water heater myself?

While some water heaters, like electric instant heaters, are relatively
straightforward to install, it’s generally safer to hire a professional,
especially for gas and solar heaters that require specialized installation for
ventilation, wiring, and safety.

7. How often should I service my water heater?

Water heaters should be inspected annually. For tank models, flushing the tank
every 6-12 months is recommended to prevent mineral buildup. Regular checks
help prolong the life of the heater and maintain efficiency.

8. What is the best water heater for hard water?

For areas with hard water, look for water heaters with anti-corrosion features
or glass-lined tanks. Installing a water softener or using descaling agents
can also help reduce mineral buildup and prolong the heater’s life.

9. Do water heaters come with safety features?

Yes, many water heaters have built-in safety features such as a pressure
relief valve, automatic shut-off, and thermostatic control to prevent
overheating. Always check for these features, especially in high-temperature
models.

10. Is a tankless water heater better than a storage water heater?

It depends on your usage. Tankless heaters are more energy-efficient,
providing hot water on demand, and are ideal for small to medium households.
However, storage heaters are often better for larger households with higher
hot water needs since they store and heat a set volume of water.

11. Are gas water heaters safe to use indoors?

Yes, gas water heaters can be safely installed indoors if they have proper
ventilation to prevent carbon monoxide buildup. Always follow the
manufacturer’s installation instructions and consider installing a carbon
monoxide detector for added safety.

12. What should I do if my water heater is not producing enough hot
water?

First, check the thermostat setting and adjust it if needed. For storage
heaters, ensure the tank isn’t sediment-filled, as this can reduce heating
efficiency. If the issue persists, it may be due to an undersized unit or a
malfunction that requires professional inspection.

13. Are there eco-friendly water heater options?

Yes, eco-friendly options include solar water heaters, heat pump water
heaters, and tankless heaters. These models reduce energy usage and carbon
footprint. Solar water heaters are particularly sustainable, harnessing
renewable energy from the sun.

14. How much electricity does a water heater consume?

Electricity consumption varies by type, size, and usage. On average, a
150-liter electric water heater used daily can consume around 1.5 to 2 kWh per
hour. Energy-efficient models and regular maintenance can reduce energy
consumption.

15. Can I use a solar water heater in areas with low sunlight?

Solar water heaters work best in sunny regions, but they can still function in
lower sunlight with backup electric or gas heating elements. However, energy
efficiency may be reduced in regions with consistently low sunlight.

16. How can I make my water heater more energy-efficient?

To improve efficiency, lower the thermostat to a moderate setting, insulate
the tank (for storage models), perform regular maintenance, and consider
installing water-saving fixtures. Tankless heaters are inherently more
energy-efficient, as they heat water only on demand.

17. Why does my water heater make noise?

Noises like popping, rumbling, or whistling are often due to sediment buildup
in the tank or mineral deposits on the heating element. Flushing the tank or
descaling can help reduce these noises.

18. Should I turn off my water heater when not in use?

Turning off your water heater when not in use for long periods can save
energy, especially for storage heaters. Some heaters have “vacation mode”
settings that lower the temperature instead of completely turning off.