GEYSER

Gas-fired water heater (6)

Solution has appeared in 2 crosswords (1 across and 1 down):

• Quick crossword No 15,883 — 2021-04-02 23:00:22
  13A: Spring discharging hot water and steam (6)
• Quick crossword No 15,287 — 2019-05-06 23:00:23
  16D: Gas-fired water heater (6)