efarmer wrote:So at about $1600 versus $250 you are saving $1800 on electricity versus an electric water heater over 5 years? How does it compare to a tankless gas powered hot water heater where you are not dealing with a 50 gallon insulated thermal mass all the time?
Ludi wrote:We put a timer (approx $30) on our old electric hot water heater so it runs only 4 hours a day and we have plenty of hot water at a fraction of the electricity usage. It'll be a couple months before I can calculate how much we're saving, but so far it's enough to offset our use of air conditioning.
Ludi wrote:We put a timer (approx $30) on our old electric hot water heater so it runs only 4 hours a day and we have plenty of hot water at a fraction of the electricity usage. It'll be a couple months before I can calculate how much we're saving, but so far it's enough to offset our use of air conditioning.
pasttense wrote:Ludi wrote:We put a timer (approx $30) on our old electric hot water heater so it runs only 4 hours a day and we have plenty of hot water at a fraction of the electricity usage. It'll be a couple months before I can calculate how much we're saving, but so far it's enough to offset our use of air conditioning.
So it's been a couple months--what are the results?
Frank wrote:The answer for domestic hot water is solar thermal. Even here in Maine solar thermal systems work most of the year. If you use an electric heater (traditional or heat pump) PV's will provide clean energy for years. Tankless coils are great for response but horrible for emissions and standby losses.
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