DHW Coils and De-liming?

DHW Coils and De-liming?

PostBy: Kungur On: Mon Jan 07, 2013 9:28 am

So last night while laying in bed my mind starts to wander. I started thinking "Is there so maintenance I should be doing on the coil?".
So any advice out there?
I await your replies so I can have a better night's sleep!
Stove/Furnace Make: Keystoker
Stove/Furnace Model: K-2

Re: DHW Coils and De-liming?

PostBy: SMITTY On: Mon Jan 07, 2013 10:40 am

I've never done it. The inside seems pretty clean each spring when I remove them.

The outside is a completely different story though. They get the twisted-wire wheel treatment - makes short work of the buildup.

These aren't DHW coils though ...
Stoker Coal Boiler: Patriot Coal - (custom built by Jim Dorsey, Taunton MA - RIP 4/18/13)
Hand Fed Coal Stove: Harman Mark III (SOLD!)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler

Re: DHW Coils and De-liming?

PostBy: Freddy On: Mon Jan 07, 2013 11:19 am

Usually nothing is done until they do not supply the hot water needed. Then a bunch of valves & an acid pump, pumping reverse to the normal flow of water...until it flows easily or 5 minutes, which ever comes first. It's smelly, somewhat dangerous & you have to have an acid pump. Acid used to be $19 a gallon. I bought a gallon last year & it was $45!!!!

PS While I was doing that sort of thing on a regular basis, we never burned through a coil (watch those 5 minutes) ....but it can and does happen, so there's always the possibility you immediately need a new coil.
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined

Re: DHW Coils and De-liming?

PostBy: Rob R. On: Mon Jan 07, 2013 11:52 am

I'd give the coil a nice flush in both directions once per year just to keep sediment to a minimum...other than that, if it is working fine stay away from the acid.
Rob R.
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: DHW Coils and De-liming?

PostBy: plumb-r On: Mon Jan 07, 2013 9:53 pm

Makers of tankless water heaters recommend flushing their coils with white vinegar. It does a fair job and will not blow through the coil, and a few gallons at the grocery store is cheap. :D
Stove/Furnace Make: Hitzer
Stove/Furnace Model: 608 Energy Master I Stoker