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Domestic Hot Water System

Supplying DHW by Gas Water Heater

DHW systems can be basically divided into two main parts:

  • the DHW heater where the DHW is heated from cold potable water, and
  • the in‐house DHW distribution system, i.e., pipes connecting the heat.

Standards stipulate the following requirements for all DHW systems:

  • Hygiene – DHW should be delivered without increased risk for bacterial growth.
  • Comfort – DHW should be delivered in reasonable time, with the desired temperature and without unwanted fluctuations in temperature.

Standards stipulate that the DHW should be delivered to every DHW tap with a minimal temperature of 50°C, but the temperature can drop to 45°C during peak situations. However, it varies depending on the DHW use (tapping types).


Selecting a Gas Water Heater

When selecting a new water heater for your home, choose a water heating system that will not only provide enough hot water but also that will do so energy efficiently, saving you money. 


  • Fuel type, availability, and cost:The fuel type or energy source you use for water heating will not only affect the water heater’s annual operation costs but also its size and energy efficiency. See below for more on selecting fuel types.
  • Size: To provide your household with enough hot water and to maximize efficiency, you need a properly sized water heater. Visit the pages on different types of water heaters (linked above) for more on sizing.
  • Energy efficiency: To maximize your energy and cost savings, you want to know how energy efficient a water heater is before you purchase it. Visit the pages on different types of water heaters (linked above) for more on estimating energy efficiency.
  • Costs:Before you purchase a water heater, it’s also a good idea to estimate its annual operating costs and compare those costs with other less or more energy-efficient models. Visit the pages on different types of water heaters (linked above) for more on estimating costs.

Residential Gas Water Heater, RHEEM/RUUD, USA

Gas Water Heaters Designed for Professionals by Professionals

Rheem offers the largest selection of ENERGY STAR® tank water heaters in the industry. On the average, water heaters last longer than any other appliance in the home. Rheem customers demand the best and we make the best and most reliable water heaters in the world.

The Rheem/Ruud Guardian System™

  • Flammable Vapor Ignition Resistance:
    • Guardian is the FVIR System that’s engineered to exceed ANSI standards.
  • Exclusive, Air Shut-Off System
    • It shuts off gas and air supplies – providing double protection.
  • Flame Arrestor Plate
    • A specially designed flame arrestor prevents ignition of vapors outside the combustion chamber.
  • Superior Air Filtration
    • It prevents the flame arrestor from becoming clogged by lint, dust, and oil.
  • Maintenance-Free! No Filters to Clean!
    • Guardian System has no filters to service, replace or clean.
  • Standard Replacement Parts
    • Guardian System incorporated a standard gas valve and Thermocouple – easy to replace.
  • It’s Easy to Light
    • No matches are required with the Rheem/Ruud Guardian System.
  • Plus…
    • Guardian System models are high altitude compliant – some models
    • certified for applications up to 6,000 and 10,200 feet above sea level.
    • Zero clearance to combustibles, rear, and side.
    • Energy efficient! Get more hot water at a lower operating cost!
    • Available on most Rheem/Ruud gas water heater models.