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[coaldozer]

I am in the process of starting to build my outdoor wood and coal boiler and was needing some advice on how to heat my domestic water-coil in tank or heat exchanger at water heater? I will be installing a grate also any help on best build for that? I've been looking on line for one but no luck , and if so I am sure they would be pricey . Thanks for any help!

[BoilerHouse]

I used two, cast iron floor grates for my boiler, each 30 inches long, 12 inches wide and, about and inch and a half thick.  They are heavy, and have stood up very well to the heat. You may be able to get something like this at a salvage yard. I am not currently heating domestic water so I can't help much there.  The plumbing section may be a better place to post this question.

[Sprinter]

Well if its a coil you want try a 007 or 006 pump since they are cheap. Wind up either 1/2"-3/4" copper into a coil. Any size will work, but what can you find cheap. Keep the flow slow for more but exchange.

Don't forget sidearms work pretty good too. I seen a set of plans and it stated an 18" unit was 68-72kbtu. If I were to make one, why not go bigger. It's just a 3/4" pipe inside a 1.5" pipe. Probably the cheapest option out there. This way its one less port or device in the boiler.
I try to size zones to use as cheap a circulator as possible. Sometimes by piping with larger pipe to reduce head and layout close.

[coaldozer]

  Thanks Boiler House and Sprinter for your  info , very helpful . I am new to this site and sure am thankful to find it