What's the preferred product to descale a tankless water heater?

pvs2487

I've got a Jacuzzi branded Riniai tankless water heater that's due for maintenece/descaling.

It has the isolation valves installed, so it looks pretty straight forward. The manual states to use a couple gallons of vinegar as the flushing solution, but I've seen products (like Haymaker) available that have good reviews.

Any preferences from the experts?

Thanks in advance.

Peter Van Syckle

Cape May, NJ

SuperTech

I use white vinegar or a product called Flow Aid. For really badly plugged copper coils Hercules Sizzle can used.

GGross

I use the Haymaker descaler on mine, plenty of people run vinegar and are happy with the results. Make sure you let the pump circulate the descaler for a good long time. I think Haymaker recommends 30-45 minutes, I usually let it run about an hour. Make sure you flush out the heat exchanger with fresh water after using any product to descale, clean any filters that may be in line before and after flushing.

hot_rod

do you have a pump?

The Haymaker kit comes with the pump, container and product. I think it works faster than vinegar and a different smell🥴

pvs2487

Thanks for the advice!

Peter

jumper

I remember muriatic acid whatever that is. Not supposed to go down drain.

ethicalpaul

It's a friendlier name for diluted hydrochloric acid. If the manufacturer says vinegar, that's a pretty cheap thing to try first