Adding a hot water heating system.

Usually we think of some add on to a house for hot water heating.

Then the next question is if the concrete roof is not poured yet why not put
the tubing in the poured concrete roof - notice the roof is going to be poured on this reinforced styrofoam of the type available at www.tridipanel.com or www.tridipanel.com.mx , each of the 3 sites displays slighly different info so check all out.

Going against that - I notice a trend in Mexico is to add a Gallera - a sheet metal
covering above the roof to cut down roof temperatures and was mentioning to
my wife perhaps we should have the architect extend the columns through the
roof to allow for this in the future. Therefore in the case it was covered,
tubing there would not work.

However given we don't cover the balcony overhang perhaps that would be a
ideal place for running tubing in the concrete. I am thinking of tubing as
is used in heating cement floors, a type of durable plastic and I think
copper manifolds. The overhang in this case is over 1 meters by 20 meters. I
am thinking in terms of perhaps 120 foot loops with no joins in the
concrete. This should then last the life of the structure as there would
never be a worry of frost this far south about on par with Hawaii for
latitude. I am thinking for a 12 bedroom small hotel this should reduce cost from over 3000.00 which was suggested for a heating system as is used to heat pool water to under 1000.00

This would limit the requirements to manifolds and pumps and storage tanks
and perhaps sensors to turn pump on and off. Original plan called for 6 of 1000 litre plastic tanks on the roof. I am thinking to use 1 to 2 for hot water.

I've attached a few photos of construction to date, though they don't show the intended overhangs that will be dropping about 3 feet to door height to limit sun exposure into the rooms. Ceilings are 3 meters (10 feet) high in part due to planned ceiling fans.