A licensed plumber that will talk with you…
i would first look into the reason why it needs replaced.
here in florida we have very hard water that causes premature failure due to calicum build up in bottom of heater causing lower element to over heat and fail or damage tank and leak. i always suggest a water softner when replacing a unit. the T&P valve should always be replaced with new unit. location is very important units located in attics should be relocated to make more servicable.
i just helped my plumber replace a water heater that was in an attic, the unit was completely inaccessable as were the elements.
always replace a gate valve with a ball valve when possible.
most states require plumbing permit to replace electric unit and natural gas, propane units require a gas permit also.
If you’re considering replacing your water heater, you should know the pros and cons of choosing between conventional and tankless water heaters.
The upside:
They never run out of hot water, take up less space and can last 5-10 years longer than tank heaters.
Smaller units can be installed in closets, in cabinets and closer to the point of use.
Most tankless water heaters come with a Federal tax rebate of $300.00, they’re more efficient with no standby heat loss, and can save as much as 20% from your water heating bill.
The downside:
Tankless water heaters can cost up to three times as much as a tank heater and use a lot of energy when producing hot water.
You will most likely need at least a 200 amp service panel and/or may have to install a electrical sub-panel as many models require 3 - 40 amp circuits to operate.
There may be a lag time when you need hot water, and most tankless units reduce the water volume and pressure and require a flow rate of at least .5 GPM in order to activate the heat exchanger.
Tankless units require cleaning, maintenance and component replacement which, depending on the model you purchase, may result in difficulty finding replacement parts.
Natural gas/propane units produce greenhouse gases, may require expensive stainless steel vent tubing and you may need a larger gas service line to insure the unit is getting enough fuel.
Other stuff:
Whole house electric tankless water heaters cost about $500-700 plus installation.
Whole house gas powered tankless water heaters cost about $1,000 – 2,000 plus installation.
Electric units are generally cheaper to install than gas units.
I hope this helps!Talk to a plumber and explain what, if any, issues you have had with the water heater you have. Also find out if there are any incentives available for you in your area.
Do Your research, get the model and serial number off the tank, along with the Mfr.'s name.
Call their warranty line, and see if the heater is still under warranty, and if so, what they will give you
towards a replacement heater.
Then call the plumber you wish to contract. and also get multiple prices from other plumbers, don’t just go with the cheapest, but again research the companies before you call & ask for a quote, so you don’t waste your time.