Water heater installation and replacement · Bethlehem, PA
Water Heater Installation in Bethlehem: Size, Fuel, Venting and the Permit
Replacing a water heater takes a few hours, but the choices behind it last for years. Size, fuel, venting, an expansion tank and the permit all matter. Some of them depend on the house, not the heater.
Dispatch passes the call to one of the plumbers in our network, who can replace a failed unit the same day or plan a swap you scheduled. Each plumber works independently and answers for their own work.
Replace the same type or change it: the first decision
Most replacements put the same kind of heater where the old one stood. That is the quick path, and it avoids new venting or wiring. A change of fuel or style is possible, but it adds work that has to be priced and permitted separately.
| If you want | What it usually involves | Ask the plumber |
|---|---|---|
| Same tank, same fuel | Disconnect, drain, remove, set the new unit, reconnect and test. | Does the old vent and gas line meet today's code? |
| Gas to electric | A dedicated circuit, a breaker and capping the gas supply. | Does the panel have room for the new circuit? |
| Electric to gas | A gas line, a flue to the outside and a permit for the new line. | Who runs the gas line and who inspects it? |
| Tank to tankless | Larger gas line, new venting, a condensate path and often a new circuit. | See the tankless heater page. |
Sizing the tank for your household
Tank size is measured in gallons, but what matters is how much hot water you use at the busiest hour. A tank that is too small runs out. One that is too large costs more to buy and keeps extra water hot for no reason.
- Count the people in the house and the bathrooms that run at the same time.
- Note whether you run a dishwasher, a laundry load and a shower together.
- Mention a soaking tub or a large shower, which draws a lot at once.
- Give the plumber the current tank size and tell them if it ever ran out.
The first-hour rating on the label matters as much as the gallon number. A plumber can compare it with what your household uses and pick a model that fits.
Venting, expansion tanks and what the old install did not have
Older heaters often lack parts that current work includes. Gas units need a clear, correctly sloped vent. Heaters on a closed water system, with a backflow device or pressure reducing valve, usually need an expansion tank. A relief valve must discharge safely.
Owners are sometimes surprised by this extra work. It is not padding. It is the difference between a heater that runs safely for years and one that stresses the pipes and the tank every time it heats.
- The vent connection and its path to the outside.
- An expansion tank, where the system calls for one.
- A level base and a drain pan under the new unit.
- The relief valve and its discharge pipe.
Ask for each of these items by name in the written plan.
Permits and who pulls them
Permit rules differ by municipality. The City of Bethlehem's permit office, in Community and Economic Development, takes plumbing permits, and its application lists water heater work. City work calls for a contractor licensed as a Master Plumber, and the permit lists show that replacements are pulled.
Ask who files the permit, who schedules the inspection and what the plumber needs from you. Whitehall Township asks for a township permit on plumbing work, done by a plumber the township licenses. Other towns often publish no water heater rule at all, so phone the borough or township office to ask.
Sources: City of Bethlehem permit application and Contractor Information; Whitehall Township permits page. Read 2026-10-30.
Keep the permit paperwork with the water heater's data plate details.
When the tank fails: replacement and removing the old unit
When a tank fails, call early in the day. A same-day replacement depends on the plumber having a unit that fits your fuel and size, and the venting and permits ready. If one of those is missing, the plumber may offer a temporary fix and book the swap.
- Clear the area around the old heater before the plumber arrives.
- Turn off the water and, if asked, the power or gas.
- Ask who hauls away the old tank and whether that is part of the job.
- Ask what happens to the gas line if the old unit is gas and the new one is not.
If the old tank leaked onto the floor, deal with the water first. The water damage guide covers drying and what to document.
Gas supply for a new or moved heater
A new gas appliance or a moved heater may need a new run of gas pipe. That work is covered on the gas line repair page, including permits and pressure testing. Ask whether it is included in the installation job or handled separately.
A gas heater needs a supply line sized for its input, a shutoff valve within reach and a sediment trap where the code calls for one. When the old heater was electric, a gas line has to be run from the nearest suitable point, and that run is separate work from the swap itself.
Ask the plumber who will run the line, who tests it and whether the permit covers it. If a gas smell is ever part of the story, the order of calls is on the gas line page.
Water heater installation questions we hear
What size water heater do I need?
It depends on how many people live in the house and how much hot water they use at once. The gallon size helps, but the first-hour rating on the label is more useful. A plumber can match it to your household. Mention soaking tubs, large showers and back-to-back laundry loads on the call.
Can a water heater be replaced the same day?
Often, yes, if the plumber has a unit that fits your fuel, size and venting. Call early in the day and say what the old unit is. If the swap needs a new gas line, a circuit or a permit first, the plumber may set a temporary fix and schedule the work.
How do I choose a water heater installer?
Ask whether the plumber is licensed and insured, who pulls the permit and what happens to the old unit. Ask for the plan in writing: the fuel, the size, venting changes and any code upgrades. Be careful of any plan that skips the venting or the expansion tank.
My electric water heater is leaking. Can I just replace it?
A leaking tank cannot be repaired, so replacement is the usual answer. Shut off the cold-water valve and the breaker, then call. Before the new unit goes in, ask whether the leak damaged the floor or the wiring and whether the tank location should change.
Is a same-day or emergency replacement a rushed job?
It should not be. A good emergency swap still tests the connections, the relief valve and the venting before the plumber leaves. The difference is that the choices are made faster, so tell the plumber early about the fuel, the size you want and anything about the space that is unusual.
Need a new water heater in Bethlehem?
Call (610) 904-7596. A dispatcher answers, asks where you are and what is happening, and sends the call to a plumber in our network serving your area. Plumbers are independent and responsible for their own work.