Eliminating their use of fossil fuels to improve the environment and their health is important to the Flanzer family, and they felt that switching their energy use to all electric was the best step in that direction. First, they replaced their gas water heater with an electric heat pump water heater. It was an easy decision, since their gas unit was nearing its end of life and BayREN and Peninsula Clean Energy had rebates for switching. After researching brands and models, they installed the Sanden (Sanco) 83-gallon heat pump water heater. Although more expensive than other units, it was their best option. They were working with a very tight space in a laundry room, and the two-piece design allowed them to house the tank indoors and the heat pump outdoors on the back side of the house. Additionally, the noise and cool air from the heat pump are out side. The Sanden also uses carbon dioxide as the refrigerant, which will not create any greenhouse gases, even at end of life. They used Building Efficiency to install it for them.
Second, the Flanzers replaced their gas furnace with a heat pump. They were surprised that BayREN offers many HVAC rebates, but not one for replacing a gas furnace with electric heat pump. Their house has two stories and the upstairs can get very hot in the summer, so it was a bonus that installing their new HVAC system would provide both heat and air conditioning. For this project, the Flanzers worked with emeraldECO. They did all the electrical work without needing a panel upgrade (125 amps) and installed a Daikin 3-ton heat pump.
Additionally, the Flanzers completed a solar project in April 2021 to offset the new energy use. They haven’t used gas since July 2021, but officially became all-electric in November 2021.
Passive Design Strategies:
- Building orientation
- Landscaping, shading
- Tree trimming for solar
- Microgrid maintains power during grid outage
- Onsite renewable energy: Tesla solar PV roof (10 KW)
- Onsite energy storage: Tesla Powerwalls
- Heat pump water heater
- Air source heat pump
- Radiant heating
- Induction range
- Gas meter removed
Contractors: Building Efficiency, emeraldECO
Solar roof and battery storage: Tesla