What to Consider When Installing a Rinnai Water Heater

If you are looking for the best hot water system in the market, selecting Rinnai hot water systems is a smart decision. Their advanced technology, class-leading gas efficiency and comprehensive warranty provide total confidence and comfort of an endless supply of hot water.

However, attempting a hot water systems installation yourself as a homeowner may cause operational or performance issues. Therefore for best results, the installations must be performed by a professional plumber who can handle the plumbing, gas, electrical and venting aspects of a tankless water heater.

5 Things to Know Before Installing Rinnai Hot Water Systems

1. Get Experts to Consult on Your Hot Water Needs and Calculate Unit Capacity

Rinnai hot water systems come in different sizes and the key criterion to identify the size of water heater you will need is to evaluate hot water flow rate. Unlike conventional water heaters where you would choose by the tank’s storage capacity, in case of a tankless water heater, you will need to calculate Delta T to evaluate the unit capacity that your home will need. You may do so by summing up the individual flow rates of all the showerheads, fixtures and appliances that use hot water and are likely to be used simultaneously at the same time in your home and then determining the temperature rise that is required to bring your home’s incoming water temperature to the desired level. This entire calculation is best left to professional plumbers like Sydney Plumbing, who can consult you with accurate calculations.

2.Size and Gas-line Compatibility to Fuel the Rinnai Unit

Unlike conventional storage water heaters, hot water systems require a larger initial flow of gas to kick-start water heating. Usually, tankless water heater provides maximum performance and operating efficiency using either a ¾” or ½” gas line, as long as sufficient gas flow is available. The continuous flow of hot water systems requires almost 3-4 times more BTUs than conventional water heaters. Thus, you will need a professional plumber to carry any pipe alterations in-order to meet the high demand for gas. In cases where gas pressures are low, you may even have to apply for a new gas supply or larger gas meter to produce a larger gas supply.

How to Properly Size Your Gas Line:

  • Determine what type of gas is being utilized
  • Determine the inlet pressure
  • Determine the allowed pressure drop
  • Determine what other types of gas appliances are sharing the gas line
  • Determine the maximum loads expected on the whole system

3. Ventilation& Location

Tankless Hot water systems have a distinct ventilation requirement and therefore modification is necessary if you are swapping from a traditional hot water system. They can be vented either through power-vent or direct-vent which subsequently determines their location. Thus power-vent units require an exhaust vent need to be installed in a spacious room or a room with sufficient vents to allow a good amount of air flow. On the other hand, direct-vent units that pull air from outside the home can be placed in more enclosed areas like an attic or a mechanical room. However, regardless of the ventilation system, they both require a category III stainless steel venting material which is corrosion-resistant and gas-tight to prevent carbon-monoxide leaks.

4. Electrical Power

Did you know that each Rinnai water heater has its own PC board and digital remote? Therefore, you need access to the standard 230-volt electric power for continuous flow of hot water. Thus, you will need to factor in the additional cost of hiring an electrician to set up the power point to run the ignition system.

5. Alter the Existing Size of Hot and Cold Pipes

Are you performing a hot water systems repairs by replacing your old conventional storage water heater? In that case, you will need to check the existing cold supply to hot water unit as also the size of the hot water outlet pipe work to allow for sufficient continuous flow of hot water, which is capable to feed multiple simultaneous requirements.

Our professional plumbers at Sydney Plumbing regularly perform Rinnai hot water heater installations across Sydney. If you would like our Rinnai specialists to perform a Rinnai water heater repair or installation, call us on 1300 730 521!!