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Tankless Water Heater Annual Flush Routine

I would venture to guess that 90% of the people who own a tankless water heater have no idea that they need a regular maintenance program to ensure that the unit lasts it’s intended life span. When I spoke to the Rinnai representative at a conference two years ago he told me their units (all tankless brands for that matter) need a de-scaling flush every 12-24 months depending on your water’s hardness and usage. Tankless Water Heaters are said to last beyond 20 years and if they are regularly maintained they should give trouble free service that whole time.
The unit in this video is a one year old Noritz (brand that my plumber favors). I’ve been mainly installing Rinnai units over the last 5 years but I’m not too brand specific. Just be sure to get one with the capacity that your family needs. Although, I am a bit biased towards the made in Japan models.
To get started you need these items:
1. A clean 5 gallon bucket
2. Small sump pump (mine is a 1/8 HP model I got at the Orange Box store for $90)
3. Two hoses to connect to the pump and your water heater. Mine are a washer connection set that was about $8
4. Two gallons of pure white vinegar
It takes about an hour and 15 minutes start to finish to do the job properly. Pretty simple for someone with a minimal handyman/woman level. -Matt Risinger