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WaterHeaterCalc

Replacing a storage tank · Beginner

Budget Tank Water Heater Replacement

Quick answer

A like-for-like electric tank replacement needs the tank, a drain pan and its fitting, two flexible connectors, a T&P valve, heat trap nipples and, on a closed system, a thermal expansion tank. That is the whole required list, and everything else on this page is optional.

This is the cheapest list that produces a correct installation rather than a cheap one. Every item here is either required by code in most jurisdictions or is the thing that stops the next failure, and nothing is included because it is nice to have.

One honest note before the list: a 50 gallon tank replacement is frequently bought at a big box store with installation attached, and that is often the right call. The parts below are where an online order genuinely makes sense, because the store markup on accessories is where the margin lives.

The complete parts list

Every line below is a real listing with a live link. Prices come from verified catalog data and change often.

The heater

$621.00

A 40 gallon short tank suits most one to three person households and fits where a tall tank will not. Check your own peak hour demand before assuming the old size was right.

Required by code in most places

$68.48

These are not optional extras. A pan with no drain is a bucket, and a T&P valve is the one component on a water heater that is never omitted.

The parts that stop the next failure

$62.61

Heat trap nipples separate copper from the steel tank so the joint does not corrode galvanically. An expansion tank is required wherever the supply is a closed system.

Ten dollars that pays for itself

$29.09

Parts list total

$781.18

10 lines across 4 groups. Prices change often and are a guide only. This is the parts list, not the installation: gas, flue and electrical work belong to the licensed trade that signs the permit.

Parts list

Get this parts list as a checklist

One email with the full list, every item linked, so you can tick it off at the supplier or on your phone.

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What you can skip

Telling you not to buy something is what makes the rest of the list credible.

  • An insulation blanket. On a modern foam insulated tank the payback is small, and on a gas tank a badly fitted blanket is a real hazard near the draft hood.
  • A powered anode rod. At this budget a sacrificial rod fitted in year four costs a fraction of it and does the same job.
  • A thermostatic mixing valve. It is the right call in plenty of houses, but it is an upgrade rather than a requirement, and it belongs on the next tier.

What to upgrade first

  • The expansion tank, if your supply is closed. Skipping it means the relief valve does the work instead, and a relief valve is a safety device rather than a pressure regulator.
  • A leak shutoff, if the heater is above finished space. An alarm tells you. A shutoff valve stops it.

The other tiers in this ladder

  • Buy Once Tank Water Heater Setup (Intermediate): The tank replacement built to last, with a powered anode, a thermostatic mixing valve for more usable hot water, leak pr
  • Long Life Tank Water Heater Setup (Expert): The tank setup built to outlast its warranty, with a plumbing supply grade tank, impressed current anode protection, ful

The other way to do this

A different project. The unit is the cheap part: the gas line upsizing and the vent are what decide whether it happens, and the service valves and descaling kit are part of the purchase rather than afterthoughts.

Frequently asked questions

Who is the budget tank replacement for?
A landlord, a rental, or anyone replacing a failed tank who intends to keep the property a few more years. Everything on the list is either required in most jurisdictions or is the item that prevents the next failure, and the "what to skip" section says plainly what is not needed.
Do I need every item on this list?
No, and the page says which ones. The required group covers what most jurisdictions ask for on any water heater installation. Everything after it is a judgment call, and the skip section explains which items genuinely do not apply to a straightforward installation on a concrete floor near a drain.
Does this include the installation?
No. This is the parts list. Gas line, flue and electrical work belongs to the licensed trade that signs the permit, and what that work costs is a different question that HouseProjectCalc covers. Buying the parts yourself and having them fitted is common and usually cheaper than a supplied-and-fitted quote.
Are these prices current?
They come from verified catalog data and they move often, especially on accessories. Treat the total as a planning figure rather than a quote, and check each listing before ordering. Availability on water heater accessories moves even faster than price does.

This is a parts list, not an installation guide. A water heater is a pressure vessel: never cap, plug or remove the temperature and pressure relief valve, and the discharge pipe runs to within six inches of the floor with no valve and no upward run. Gas line, flue and vent work belongs to a licensed plumber or gas fitter, because improper venting produces carbon monoxide. Turn the breaker off before touching an element and never energise one that is not submerged. Water at 140 F scalds a child in seconds, which is what a thermostatic mixing valve exists to prevent.