Water Heater Replacement: What You Need to Know

If your shower’s getting cold mid‑wash or your hot‑water bill is soaring, it might be time for a new water heater. Replacing the unit isn’t as scary as it sounds, especially with a clear plan. Below you’ll find the key steps, typical timelines, and budget tips so you can get hot water back without the headaches.

How Long Does a Replacement Take?

Most professional installers finish a standard tank‑type heater in under four hours. The clock starts when they arrive, shut off the power and water, drain the old tank, and then hook up the new one. If you have a larger capacity model, a limited‑space location, or need to upgrade from electric to gas (or vice‑versa), you might add another hour or two for extra plumbing and permitting work.

Homeowners who try a DIY swap can stretch the job to a full day, especially if they’re unfamiliar with the venting or electrical connections. The biggest time‑sinks are locating the right shut‑off valves and making sure the new unit fits the existing space. In short, expect a half‑day for a pro install and possibly a full day if you’re doing it yourself.

Key Costs and Choosing the Right Unit

Pricing varies by size, fuel type, and brand. A 40‑gal electric heater typically runs £400‑£600 including labour, while a gas model of the same size can cost £600‑£900. High‑efficiency units with a better Energy Factor may be pricier upfront but can shave 15‑30% off your energy bill each year.

When picking a heater, think about your household’s hot‑water demand. A family of four usually needs a 50‑gal tank, whereas a couple might be fine with 30‑gal. Also consider the space: point‑of‑use tankless units fit under sinks but cost more per kW and may need a larger gas line.

Don’t forget to ask about warranties. Reputable brands offer 5‑year parts coverage, and many installers include a service guarantee for the first year of operation. A solid warranty can save you money if a component fails early.

Before the work begins, have the installer run a quick check on your existing pipes and electrical circuit. Old copper or corroded fittings can cause leaks later, and an undersized circuit may trip the breaker once the new heater draws power. Spotting these issues early avoids surprise charges after the job’s done.

After the replacement, run a flushing cycle to clear any sediment that could shorten the new tank’s life. Most pros will do this as part of their service, but it’s a simple DIY task too: fill the tank, let it sit a few minutes, then drain it completely before refilling.

Finally, schedule a yearly maintenance check. A quick inspection of the anode rod, pressure relief valve, and thermostat keeps the heater efficient and spot‑free. Many local services, including Glastonbury Appliance Repair Services, offer a maintenance package for under £50 a year.

Replacing a water heater doesn’t have to be a hassle. With the right information, a realistic timeline, and a clear budget, you’ll be back to hot showers in no time.