What Size Tankless Water Heater?
Posted on | April 24, 2010 | 4 Comments
What size and type of tankless water heater should I use on a house with 4 bathrooms and regular appliances, like dish washer, washer, dryer.
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4 Responses to “What Size Tankless Water Heater?”
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April 24th, 2010 @ 6:27 pm
I just wanted to give you a heads up on installing a tankless water heater. We purchased a smaller one thinking that all that would have to be done is run a new vent and a little work on the gas lines. It seems that the gas line on our home was too small, and our gas pressure was too low. We also had trouble finding a plumber who would even install the thing, apparently it’s not caught on here yet. Check with a plumber before buying one.
April 24th, 2010 @ 7:06 pm
With that many bathrooms you would be better off with point of use.
April 24th, 2010 @ 7:44 pm
Here is a great tool to use to find out what size heater you need. http://www.rinnai.us/tank_compare/choose_a_rinnai.php It is from the rinnai company which is one of the main manufacturers of tank-less water heaters. It uses your zip code and details about your number of bathrooms and fixtures to determine which heater will fit your needs. One tricky questions it asks is if you want an inside or outside mount heater. The outdoor heaters are the cheapest to install and they work great but they are visible from outside obviously and they may require additional plumbing to get the water to them and back if your current heater is inside. The indoor mounted are more difficult and costly to mount because you have to run the vent outside but they prevent a big ugly box from mounting on the side of your house. Good Luck.
April 24th, 2010 @ 8:43 pm
You have a lot of bathrooms but realistically, how many showers do you ever have going at the same time. Most normal fixtures are about 2 gallons per minute. Just add the number of fixtures you will be running at the same time and that would be the flow rate you need.