The time it takes to install a water heater varies depending on the type of water heater and the complexity of the installation:

• Standard tank water heater installation typically takes about 2 to 4 hours. This includes removing the old unit, positioning the new one, connecting plumbing and electrical lines, and testing the system

• Tankless water heater installation usually requires more time, ranging from 4 to 8 hours or sometimes 3 to 5 hours, because it often involves additional plumbing, gas line work, electrical adjustments, and mounting the unit

• If you are replacing a tank water heater with a similar model, the process is faster, often around 2 to 3 hours. Switching from a tank to a tankless system or changing fuel types (gas to electric or vice versa) can extend the installation time due to the need for new connections and modifications

• Heat pump water heaters installation can take about 4 to 8 hours , similar to tankless units, due to their complexity and additional requirements

Additional factors that can affect installation time include the condition of existing plumbing and electrical systems, whether new lines or vents need to be added, and the need for permits or inspections

. In summary, a typical water heater installation can take anywhere from 2 to 8 hours , with tank water heaters on the shorter end and tankless or heat pump models on the longer end