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Why pipe indirect hwh with 1.25\" if fittings are 1\"?
in many indirects that limit how many btu's you can safely push through. Most manufactures have this info in their installation, and often websites. Not a lot of sense in over piping if the limitation is in the coil. Ideally you would calculate the pipe size based on flow, distance, fittings, etc.
Some indirects can handle larger fows. tank in tank or the reverse indirects like Ergomax and Thermomax can handle larger flows. You will see these with 1-1/2 or larger connections.
A `circulator with an built in flow check is another way to prevent ghost flow. depending on the piping arrangement, you may need a check on both supply and return. Generally it is a good idea to use both checks with PS piping.
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