Rheem and AO Smith are two top water heater brands. AO Smith lasts longer and is more efficient, especially in hard water areas. Rheem is cheaper upfront and easier to repair. Choose AO Smith for long-term value, Rheem for short-term savings.
Water Heater Comparison: Types, Lifespan, and When to Repair or Replace
When you’re dealing with no hot water, the first thing you think about is replacing your water heater, a home appliance that heats and stores water for showers, sinks, and laundry. Also known as a hot water tank, it’s one of the most taken-for-granted systems in your house—until it stops working. Not all water heaters are the same. You’ve got electric, gas, tankless, and hybrid models, each with different costs, lifespans, and repair needs. A gas water heater might last 8 to 12 years, while a well-maintained electric one can stretch to 15. Tankless units last longer—up to 20 years—but they cost more upfront and need professional servicing.
Before you rush to buy a new one, check if it’s even worth repairing. A water heater reset button, a safety feature that shuts off power when the unit overheats tripping isn’t a sign you need a new heater—it’s a sign something’s wrong with the thermostat or heating element. Same goes for strange noises, rusty water, or leaking around the base. These are common signs of water heater failure, often caused by sediment buildup, corroded anode rods, or faulty components. Many of these issues can be fixed for under £150, especially if caught early. Replacing a heating element or flushing out years of gunk can bring your old unit back to life without the hassle of a full install.
Then there’s the cost question. Is it cheaper to repair or replace? If your heater is over 10 years old and you’re already spending £100+ on fixes, it’s usually smarter to upgrade. Newer models are more energy-efficient, which means lower bills. But if it’s under 8 years and the problem is simple—a bad thermostat, a tripped breaker, or a clogged dip tube—repair makes sense. And don’t forget: if your heater is gas-powered, any repair involving the gas line must be done by a Gas Safe registered engineer. DIY fixes on gas units aren’t just risky—they’re illegal.
What you find in the posts below isn’t just theory. It’s real-world advice from people who’ve been there. You’ll see how to diagnose a failing water heater before it floods your basement. You’ll learn why pressing the reset button might give you hot water for a day—or a week—but won’t fix the root problem. You’ll find out which brands and models hold up best in UK homes, and what maintenance steps actually make a difference. No fluff. No sales pitches. Just clear, practical info to help you decide whether to fix it, replace it, or wait until it gives up for good.