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I'm biding on a job that hase a 2 pipe gravity system 2 supplie pipes & 2 return pipes.*First thing they want to get rid of 2 cast radiators!Ya I know (why) she wants them out of her kitchen!!! do i just cap off the lines below in the floor, or loop them to help with the water volume?*2nd they want to add low temp radiant under the existing hard wood floor in the kitchen (I know about the temperature limits but will hear all inputs on the subject as I can aways learn more! I was planing to use extruded alluminum staple up panels with snap in tubing to the bottom of the floor then insulate with foil backed insulation under tubing & plates? *3rd. there will be a 2 story addition going on th the old home. In floor as well, some hard wood some tile some carpeting. How is the best way to tie into the old 60-70 year old gravity system(that has been converted from coal to oil to nat gas) and use pumps that will not harm the existing system? My though is to also update the system with a new high eff. boiler and reconfigure the old system to also use a pump. I know about how to down size the piping, new expantion tank,low head large volume etc. I might also use a triangle tube boiler with dhw priority for the old system and then primary secondary for the new infoor. what do you think??But what if I can not get them to spring for the new boiler! i do not want to do any harm to the old system! I'm here to learn
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