1 or 2 coils in Harman III

TCMW · By: **TCMW** On: Sat Oct 13, 2012 7:32 pm

Justed got a Harman III.

Want to use the 21T hot water coil. http://www.hilkoil.com/product.htm
Have a 200btu oil boiler with 80gal phase III indirect water heater, three zones and six people in Conn..
I'm gonna pipe the water to the boiler with a three speed cicr.

No btu rating on the 21T coil. Wondering if 1 is too little or 2 is too much.

Also if anyone is running Harman III which size coal they like best.

Many Thxs Sam

Cap · By: **Cap** On: Sat Oct 13, 2012 8:06 pm

Nut coal works best with that shaker system. You could even use stove coal. I am not a big fan of pea coal but your Mark III could use pea too.
I'd go with the biggest coil or most coil I could fit. The single U shaped coil may not be enough, speaking of which, I have a new unused U-shape coil, SS 1" M NPT ends I'd part with if anyone is interested.

TCMW · By: **TCMW** On: Sun Oct 14, 2012 9:12 pm

Thxs Cap for the advise.

Read some posts today on how the coils pitted bad for smitty. gonna have to passivate them with naval jelly before install and stop any condensation. wonder if i have them chrome plated first?

Still havent setup the 6"flue. wondering about masonry now?

Bootstrap · By: **Bootstrap** On: Tue Oct 16, 2012 8:08 am

Here's a question about the coil that goes into that stove, can you fab one out of iron pipe? The same kind of pipe used for natural gas or propane lines?

SMITTY · By: **SMITTY** On: Tue Oct 16, 2012 9:45 am

Steer clear of Hilkoil - there's another company out there with MUCH BETTER ethics & products. The name escapes me at the moment but I'm sure you'll find it in the links below somewhere ...

Don't say I didn't warn you ... and be sure to click on the link to the other thread within this one: Interesting info for those looking to purchase Hilkoil coils

EarthWindandFire · By: **EarthWindandFire** On: Tue Oct 16, 2012 1:26 pm

Hi Bootstrap,

Yes, you could make a coil out of iron pipe. The water jacket in my Hitzer 75 is made out of black pipe and has little to no rust at all on it after 30 years. In fact, maybe iron pipe is better, due to wall thickness, than stainless?

You can find pictures of my stoves water jacket under the title Hitzer boiler.

TCMW · By: **TCMW** On: Tue Oct 16, 2012 7:05 pm

Thxs guys for the input.

From what I have read and discussed I like the idea of buying 316 stainless elbows 150#(7.00ea x6) & nipples.

Then apply the Passivation jelly and install.

Cap · By: **Cap** On: Tue Oct 16, 2012 8:59 pm

I like the sch 40 ( or is it sch 10 ) pipe manifold, but why use petroleum jelly? I'd use good quality neverseize.
Buy 316 if you can find it.

1 or 2 coils in Harman III

1 or 2 coils in Harman III

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