Quote:
Originally Posted by Piotrsko
Shorter plumbing runs, yes. You're just moving heat from outside radiation to inside radiation which may be a benefit in your climate, but the insulation additions to keep the heat in the core may negate the cheaper plumbing.
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Even if it would still be insulated enough to prevent heat irradiation to become discomfortable on summertime, the lower cost with plumbing is already a desirable feature. Not to mention the shorter plumbing runs would decrease the heat loss on the way from the boiler to the tap or the shower, which would allow to use fewer power.