Radiant Floor Heating/Home made pool heater

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Question
I currently have a DIY wood-fired pool heater.  I have diverted from the pool pump, directly through the fire via copper pipes in a Vogelzang Barrel stove, and then back to the pool.  It works but not well enough.  Too much heat is lost.

Here's my questions;  I want to use a 30 gallon drum inside a 55 gallon drum.  Use the smaller drum for the fire box.  I'll divert the pool water into the 55 gallon drum, the water will pick up heat from the outside surface of the firebox and flow back to the pool (no piping necessary inside the unit)  It wont be a closed system so it shouldn't explode.   Will normal welding of the  big drum to the little  drum make it water tight?  will it resist heat?  in your humble opinion,  can it work?

Answer
What you describe is in fact a closed hydronic system (sealed from the atmosphere and capable of building super-atmospheric pressure). Yes it could blow up. You will want to get some help before making pressure vessels without the benefit of specific education or instruction.  

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Morgan M. Audetat

Expertise

Radiant panel heating design, including floors and ceilings, European wall panels and snow melting for residential and light commercial buildings..............................................................-Master of Steam and Hot Water,City of Minneapolis....................................................--- Master Plumber, State of Minnesota...........

Experience

30 years..... Charter Board Member - Radiant Panel Association, former manufacturer of condensing boilers, former national distributor of radiant floor products, son and apprentice of mechanical & plumbing contractor. Current owner---www.BadgerRadiantDesigns.com---Minneapolis mechanical/plumbing contractor specializing in hydronic based, integrated HVAC systems. Radiant floor heating/cooling. Snow Melting. Condensing Boilers. Indirect water heaters. System design, consulting and technical training world-wide. Licensed contractor, designer, installer and consultant.

Education/Credentials
B.S. University WI 1981 CONTINUING EDUCATION: Viessmann Condensing boiler and Solar water heating certification 2010, N.D.S.U. Lead Worker RRP certification 2010, Knight condensing boiler certification 2009, Wrightsoft Manual J CAD certification 2009, RPA Designer & Installer Certification 2008, Nate Hydronic/Forced Air Certification 2008, Uponor/Wirsbo advanced design school certification 2007, Buderus Wall-hung certification 2007, Power Limited License (low voltage controls) 40 CE credits 2005, Basic Hydronic Certification IPEX & Northern Alberta Institute of Technology 1998, Charter Board Member - Radiant Panel Association 1994, Residential Off-Electric to Hydronic Conversion Heating School Canadian Hydronics Council 1994, B&G Little Red School House 1993, Rood Utilities (now Auburn Technical Institute) Oil Burner School 1993 ,Tekmar Controls residential and commercial 1993, Division Manager and Advanced Hydronic Seminar Instructor for the first Exclusively Hydronic Radiant Floor Distributor in the USA 1990, Hydronic Radiant Heating Association Workshop participant with Richard c. Bourne, PE spring 1988, Master Plumbing, Hydronic, Solar Course Red Rocks Community College 1987.

Awards and Honors
2009 System Showcase Award - Radiant Panel Association

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