PV Gap

Manuel Said:

How do I solve for this?

We Answered:

Pressure in the tank

= Pressure at the top + Pressure difference

= 1 atm + ( density of water * g * h )

= 101325 + ( 1000 * 9.8 * 12 ) [ [ in Pascals ] ]

= 218.925 KPa

.

Marie Said:

central Heating without the use of gas,lpg,oil?

We Answered:

LP gas is the most economical heat for rural areas in the US. If you have a decent distribution network in your area, it's probably the same there. Wood burning for heat is fairly high in pollution unless you have a modern wood stove. You also need your own woodlot and be willing to cut wood often for it to be economical. consider what you can do with even a portion of that time to earn money and buy LP.

Aaron Said:

What are the most eco-friendly methods of heating water in a house?

We Answered:

there are 2 types of solar panels, photovoltaic - that create electricity to use for any purpose (like heating water) and solar thermal - used for collecting heat which is typically used to heat your home, your hot water, or even your pool. The former are typically expensive, the latter can vary a lot in price depending on technology. I wouldn't dismiss solar thermal collection before exploring it. It is likely more expensive, and certainly more complicated than a standard (and probably tankless) hot water heater too, but remember the difference is paying for the higher cost up front, then getting essentially free energy for years. The cost of energy will likely keep rising over time too, so saving 50% now might cost you a whole lot more over the lifespan of the product you buy.

Depending on your location, a geothermal heat pump system can be much more efficient for heating and cooling your whole house, as well as heating water. Its not worth it for just hot water, but if you are looking at larger solutions these systems get rave reviews. Cost is high, but again you are paying up front and saving in the long run.