The big decision: tank Vs. tankless gas water heater

Tankless gas water heaters offer the following advantages over traditional tank-style water heaters:

-Ability to provide endless hot water on demand
-Higher energy efficiency
-Lower operating costs
-Space savings

Note: Typically (but not always), condensing tankless gas water heaters have two heat exchangers, and non-condensing models only have one.
The extra heat exchanger in condensing tankless gas water heaters uses heat from the exhaust gas to preheat the inflowing cold water. This means condensing tankless gas water heaters are more energy efficient, and have cooler exhaust gas to vent.
Source: Navien – 

Also, Condensing tankless gas water heaters require  proper disposition of acidic condensate.

Tankless gas water heater

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Standard Gas Water Heater
~$2,000 to $3,000 product + installation by licensed plumber 
Local Utility rebates on ENERGY STAR® certified models up to $700
Natural gas operating cost ~$300/year
Propane gas operating cost ~$500/year
Tankless Gas Water Heater
~$4,000 to $7,000 product + installation by licensed plumber 
Local Utility rebates on ENERGY STAR® certified models up to $1,500
Natural gas operating cost ~$240/year
Propane gas operating cost ~$500/year

Look for local qualified plumbing professionals.

We invite you to fill-in the form below. We will connect you with maximum 3 qualified installers in your State who typically quote a competitive standard install flat price before stepping into your home. If your Utility offers a rebate that you can take advantage of we will make the Contractors aware. By clicking “submit” on the form below, you provide your express written consent to be contacted by up to the  3 Contractors regarding your quote request for a Heat Pump Water Heater or a Tankless Gas Water Heater. You agree to receive communications regarding a water heater quote via phone, text, or email, including the use of automated technology, even if you are on a Do Not Call list. Consent is not a condition of purchase.

Please input a valid email where you can be easily contacted
Please input your zip code
Please indicate where your existing water heater is currently located in your residence
Say “Yes” if you have applied and received a voucher from your State to discount upfront your next Heat Pump Water Heater purchase
If you have received a voucher from your State, Indicate the face value of the State voucher that you have received to discount upfront next Heat Pump Water Heater purchase
Your residence type
Heat Pump Water Heaters pull heat from the localized surrounded space and need at least 10′ x 10′ to operate efficiently
Heat Pump Water Heaters help dehumidify the space by pushing our cool dry air and creates non acidic condensate (about 2 quarts/day) that needs to be drained out
Examples: 40, 50, 80 This will help properly the Contractor size your new Heat Pump Water Heater
Examples: 100, 200 This is in the case you are replacing a gas water heater. The size of your panel (and the available incentives) will help the Contractor quote upfront a 240V or 120V Heat pump Water Heater with or without electrical panel upgrade
This is in the case you are replacing a gas water heater. The size of your panel (and the available incentives) will help the Contractor quote upfront a 240V or 120V Heat pump Water Heater with or without electrical panel upgrade
The Contractor will confirm if your Utility offers a rebate for the Heat Pump Water Heater that is being quoted

Legal Disclaimer:

NewWaterHeaterDecisions.com is a marketing and lead generation platform, not a licensed contractor. All installation services, structural modifications, gas and electrical work are performed solely by independent contractors who maintain active licenses with the State. NewWaterHeaterDecisions.com does not provide bids, perform construction, or guarantee the final pricing offered by independent contractors. 

Resources: Basic principles to properly size a tankless gas water heater