I am trying to educate myself a bit on some work we are doing at our home and I need to make sure I ask for the right bid.
All.. I have a scenario that I need some opinions on.
Our wish list
We are looking to replace our existing hot water storage heater with the most energy efficient tankless solution that we can, yet still be practical with the cost of putting it into service. We live an an area in which our ground water is approx 45 degrees and we sleep with the house at 60 degrees at night. We would also like to stop wasting 2 - 3 minutes of water (approx 6 gallons of water) every morning that we shower while we wait for the hot water to arrive. We don't mind pushing a button (or something similar) and waiting 20 - 30 seconds for the hot water to arrive at the faucet - we just do not want it to go down the drain. We want to make sure that we aren't using the existing water lines as a mini storage tank - which would defeat the purpose of efficiencies. We also do not want water from the hot water line to be puleed into the cold water line when the cold water is turned on. Our home is approximately 3200 square feet and is finished and we don't have a dedicated recirculation line. I am making an assumption that it will be expensive to retrofit a dedicated recirculation line into our home.
For the tankless solution we are looking at a Navien (NR210, NR210A, NR240 and NR240A) - I think we'll need the NR240/NR240A unit because of the 75-80 degree temperature rise that we'll need during the cold months. To help with the waste of water we are looking at a Taco D'Mand, RedyTemp, or ACT Metlund D'Mand.
With the wishes that that we have will the potential solutions suffice?
With the circulators listed should you go with one of the Navien 'A' units or not?
Is there anything else that I should be considering to meet our wishes?
In advance I appreicate your feedback as it will help me intelligently choose the right contractor for my job.