# Quick Answer: What Size Rinnai Direct Vent Heater Do I Need?

## How big of a Rinnai tankless water heater do I need?

Rinnai tankless gas water heaters need a demand of at least 0.4 to 0.6 gallons per minute of water flow through the hot side to ignite and 0.26 gallons per minute to stay in operation.

## How big of a gas wall heater do I need?

For example, a 300 square foot room typically requires 7,000 BTUs to maintain a comfortable temperature, while a 1,000 square foot room requires 18,000 BTUs. A simple formula to determine your heating needs is: (desired temperature change) x (cubic feet of space) x. 133 = BTUs needed per hour.

## How do you calculate Rinnai flow rate?

To calculate the flow rate, consider how many outlets might possibly be used at once. Calculate the rough flow rate through each outlet for the total flow. The result is roughly what you will use in litres per minute (L/min) at peak demand times in your facility.

## Are Rinnai heaters efficient?

“Rinnai is known for product quality and reliability. Additionally, the Rinnai Q Series Boilers earned between a 95 and 95.4 percent AFUE rating, ranking them among the most efficient heating-only boiler options available.

You might be interested:  Quick Answer: How To Stop Kerosene Heater From Smoking?

## What is the downside of a tankless water heater?

The primary disadvantage of on demand or instant hot water heaters is the upfront cost. The smaller units that you often see won’t produce enough hot water to serve most households. They’ll only serve one faucet at a time—a problem if you want to shower while the dishwasher is running.

## How do I calculate what size heater I need?

What Size Heater

1. Multiply the length times the width times the height to calculate the volume in cubic feet.
2. Multiply the room’s cubic footage by 4 if its walls contain fewer than 3 inches of insulation.

## How many square feet will 40000 Btu heat?

To heat a 2,000 square foot home, you will need approximately 40,000 BTU’s of heating power.

## Can a tankless water heater fill a tub?

Please remember that tankless water heaters also come in different sizes, and you need to get a unit that will deliver a strong flow to the tub. A small tankless water heater can take a long time to fill a large tub. Whatever way you choose, at least now you’ll finally be able to relax in a nice, hot whirlpool tub.

## How many gallons per minute should my tankless water heater be?

The best sizing factor for a tankless water heater is its flow per minute rate. A 3.2 gpm, tankless heater can heat 3.2 gallons of water per minute, which is roughly enough to provide hot water to a shower and a sink. To find the correct capacity, add up all of the fixtures that you expect to use at the same time.

You might be interested:  Quick Answer: Knocking Sound When Heater Is On In Car?

## How many gallons should my water heater be?

But if you only need a loose estimate of what size you need (versus an exact calculation), follow these guidelines: For 1 to 2 people: 30-40 gallons. For 2 to 3 people: 40-50 gallons. For 3 to 4 people: 50-60 gallons.

## How do I choose a Rinnai heater?

Multiply the square footage by the BTU per square foot to arrive at the total BTU rating you’ll need from your Rinnai heater. All Rinnai heaters are rated for a particular number of BTU, ranging from 8,000 up to 40,000 or more, giving you a lot of flexibility in the model you can buy.

## How long does a Rinnai wall heater last?

The life expectancy (or useful lifespan) of a Rinnai tankless water heater is up to 20 years. Actual life is impacted by water quality, usage and proper maintenance. For comparison, a tankless water heater lasts about twice as long as a tank water heater, making them a better value in the long run.

## Do Rinnai wall heaters use electricity?

Rinnai has some small direct vent wall furnace. One model has a 58W power draw.