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Old 11-08-2010, 05:16 PM   #1
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Piping up Thermolec electric boiler


Hi,
I'm really a carpenter by trade but I have a 'pet project' installing a hydronic infloor heating system in my new workshop/garage so I'm looking for advice on piping in the electric boiler, a Thermolec.

The boiler has a stainless steel tank with 1 1/4" npt outlet and inlet and I want to connect to 3/4" copper going to pump and manifolds. I'm wondering about the dielectric potential, should I come off the boiler in galvanised steel then transition to copper with dielectric unions to avoid potential corrosion problems or is there also a problem in connecting iron to stainless steel?

Also, is it permissible to use 1 1/4' to 3/4" reducing bushings at the boiler?

Thanks in advance
Rich

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