Gas tankless water heaters are our specialty at Supreme Plumbing Service — and here's the one thing most Clark County homeowners don't hear when they buy one: the manufacturer requires annual service to keep the warranty valid. Skip it and you're not just risking performance, you may be voiding coverage on a unit that cost you real money.

Why tankless units need it (and tanks don't as much)

A tankless heater runs your water across a heat exchanger on demand. Every gallon leaves behind a little mineral scale, and our Southwest Washington water leaves plenty. That scale builds up inside the exchanger, chokes the flow, and forces the burner to work harder for less hot water. A traditional tank hides sediment on the bottom; a tankless has nowhere to hide it — so it needs a yearly descale (flush) to stay healthy.

What happens if you skip it

  • Weak or fluctuating hot water — scale narrows the exchanger, so flow and temperature drop.
  • Error codes and shutdowns — many units throw a maintenance/scale fault and stop heating until serviced.
  • Higher gas bills — a scaled unit burns more to deliver the same hot water.
  • A voided warranty — most manufacturers can deny a claim if you can't show the unit was serviced on schedule.
  • A shorter life — a neglected tankless fails years early; a maintained one can outlast two tanks.

What annual service actually includes

When we service a gas tankless, we descale (flush) the heat exchanger to dissolve mineral buildup, clean or replace the inlet water filter, check the burner and venting for safe combustion, and confirm the unit is holding temperature and flow. It's a straightforward visit — and we log it, so you have a record if you ever need to make a warranty claim.

It's not just tankless

Tanks, hybrids, and boilers benefit from yearly attention too — a tank flush clears sediment before it insulates the burner, and a boiler checkup keeps your heat reliable through winter. Whatever you're running, an annual visit is the cheapest insurance against a cold-shower surprise.

Stay ahead of it

If you've never had your tankless serviced — or can't remember the last time — it's worth booking. We service every brand and fuel type across Clark County, and we'll tell you honestly whether it needs a descale now or can wait. Reach out for a service appointment and we'll get you on the schedule.