Tips to Maintain Under Sink Water Heaters

Tips to Maintain Under Sink Water Heaters

Under sink water heaters are an extremely energy-efficient and eco-friendly way of getting hot water fast. Most heaters deliver hot water in as little as 2-3 seconds, with a 25% saving on wasted water. These types of point-of-use water heaters can also be considerably healthier, as the water has less opportunity to become contaminated by sediment and bacteria. Whatever the weather, the water from your under sink water heater will always be delivered quickly and piping hot, and as soon as you turn off the tap, no more energy is wasted.

If you only use a small amount of hot water daily, the energy savings can be significant, as an under sink water heater is typically up to 35% more energy-efficient than a conventional hot water tank. These units are typically robust and long-lasting, with a life expectancy of 20 years or more. They’re also remarkably easy to maintain, and parts can be replaced with ease to extend their usable life. Compact and space-saving, an under sink water heater is a cost-efficient addition to any home.

Maintaining Your Under Sink Water Heater

Periodic maintenance of your under sink water heater will keep it working at optimum energy-efficiency and extend its usable lifespan. Always switch off the unit before undertaking any routine maintenance, and use genuine replacement parts if a repair is necessary.

You should periodically adjust the water temperature and water flow to ensure they’re working at optimum efficiency. This can be done by adjusting the suppressing-shutting-off valve while the tap is running. The water filter also needs periodic cleaning to ensure an even water flow, and you’ll also need to clean out the drain tube sprinkler at the same time to keep the heater running smoothly. Build these simple routines into a proper preventative maintenance schedule and your unit should be trouble-free.

Common Issues with Under Sink Water Heaters

Water leakage: check all joints and PVC piping regularly – frequent activity in the area of the heater can cause leakages. Tighten joints and install a drip pan to protect the floor of the cupboard and avoid opportunities for the build-up of mould and mildew.

Blocked Pipes

Installations in limited space, such as under a sink, can cause pipes to become clogged. Use a plumber’s snake or drain-cleaning products to shift any blockages. If you suspect problems are being caused by mineral build-up, use a water softener to deal with the problem. Performing simple and regular maintenance to keep pipes unblocked will extend the life of your heater.


Most under sink heaters are electric and should be put in by a fully qualified installer to minimise any problems. With water and electricity so close together, there is a potential hazard, but if you keep all circuitry insulated and covered and keep wires as far away from joints and pipes as possible, then any risk will be minimised.

A heater of this kind can be very useful, but it does need some routine maintenance if you want to get the most from it.

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