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While I agree with you in principle, @DanHolohan , I have one other — and it's major — concern. If this regulation is necessary — and it may be — it points to two underlying problems. The first is that the people who own and maintain buildings are assumed to be incompetent to perform proper maintenance. This may be true… but the assumption is unfortunate. The second, however, is a deeper problem: it was one assumed that the parents had an absolute and unbreakable responsibility to care for their children, to teach them well (in many different ways!) and to protect them from harm..

This relatively minor regulation is just another one saying that the parents can outsource that responsibility to "society" without consequence — indeed that it is preferable that they should do so.

Not sure I like that.

That's their "Rococo" model. We see a lot of them around here- and yes, they are beasts to move around!

The most creative solution I see is bringing the end of the main in the garage over the garage door as a dry return then either dropping it and the other main in to a wet return and bringing that around the perimeter to the boiler together or brining them separately around as dry returns and at some point dropping them down in to a wet return that goes to the boiler.

the dry returns must drop below the water line before they connect together. if they connect together above the water line, steam from the main that fills first can flow to the main that isn't yet filled through the return and close the vent on that main, preventing it from fully venting and making it slow to heat.