Water Heater Replacement | Tank Units Installed and Swapped in Levittown, PA

Replacement: signs the old tank is finished

Repairing a tank makes sense until it stops making sense. Several signs say the better move is a new unit, and it helps to know them before the heater fails on a cold morning.

• Water pooling under the tank, or rust-colored streaks down the side
• Rust-tinted hot water, or a metallic taste that clears when the hot tap runs
• A tank old enough that the label date is a decade or more behind you
• Repairs stacking up, with a second part replaced inside a year
• Rumbling or popping from sediment that a flush no longer clears
• Hot water that runs out far sooner than it used to

A planned replacement beats an emergency one. You pick the unit, you choose the day, and the plumber arrives with the right parts. A tank that fails on its own often takes a floor or a finished space with it, which is why the repair page is worth reading first if the heater is only misbehaving.

Installation: what happens on the day

A standard tank swap runs in a clear order. The steps below are the ones to expect, and each one is a place where a plumber should tell you what is being done and why.

1. Shut off water and fuel, drain the old tank and disconnect it.
2. Remove the old unit and check the pan, the floor and the nearby fittings.
3. Set the new heater, connect water lines with new fittings and fit a relief valve with a discharge pipe.
4. Connect gas and the vent, or wire and ground an electric unit.
5. Fill the tank, purge air, light or power the unit and test for leaks and gas.
6. Set the temperature, show you the shutoffs and take the old unit away.

Venting deserves particular attention on gas units. A flue that does not draw can push combustion gases into the house, so the plumber checks the draft with the unit running. If the gas line needs work to serve a new unit, the gas line page covers that side of the job.

Gas, electric, hybrid and heat pump: choosing a type

The fuel decides most of the install. Replacing like with like is the simplest case, since the vent, the gas line or the circuit are already there. Changing fuel adds work, and the table shows why.

A point-of-use or under-sink unit is a small supplement, not a replacement for the main heater, and it suits a far-off lavatory better than a whole house.

Expansion tank, permit and code

Three items outside the heater itself decide whether the install is done properly. A thermal expansion tank absorbs the pressure that builds when water heats in a closed system, and many systems need one, especially when a pressure-reducing valve or a check valve sits on the supply. The relief valve and its discharge pipe protect the tank from over pressure. And a permit, where one is required, puts the work on record.

The rule depends on the address. Water heater swaps in Philadelphia, Bustleton included, call for L&I paperwork: a permit and a certification form, with a licensed plumber doing the work. For Bristol Township or Bensalem addresses, a quick call to the local building department settles whether a permit applies before the day of the job. Ask the plumber who pulls the permit, and keep the paperwork.

Source: Philadelphia L&I plumbing permits.

Who installs it, and what to ask them

A water heater install is plumbing work, gas work and sometimes electrical work in one visit, so the person doing it matters. Plumbers sent through this line are licensed and insured plumbers serving your area. Before the visit, it helps to have a short list of questions ready.

• Which unit are you installing, and what size is it?
• Will the old vent, gas line or circuit be reused, and are they in good condition?
• Does the job need a permit here, and who files it?
• Is an expansion tank included, and where will the relief valve drain?
• How will you test for gas and leaks, and what will you show me before leaving?

Same-day replacement is offered when a plumber is open and a suitable unit is on hand. A heater that has failed completely is the case the dispatcher treats first.

Tank or tankless?

The choice comes down to space, demand and installation scope. A tank is the simpler, lower-cost install and is easy to service. A tankless unit takes less room and keeps hot water coming for as long as you need it, but it often needs a larger gas line, new venting and regular descaling. The tankless page walks through that case. Hot water that runs out and a heater that is in the way are the two usual reasons owners switch.

Water heater installation questions, answered