Solar hot water system:
Four (4’ x10’) Heliodyne Gobi flat plate collectors – 160 sq.ft.
STSS 328 gallon storage tank with two 120’ copper coils – one for domestic hot water, one for radiant floor heat
STSS 160 gallon storage tank with 6,000 watt element and 120 ft copper coil for backup heat – not yet used
Drainback design – no antifreeze, just plain water ( ¼” per foot pitch)
Caleffi iSolar BX differential temperature controller with display unit in kitchen
Grundfoss sensors measure kWh –temp. leaving tank, temp returning to tank, flow rate
Tank temp. limited to 160 degrees F.
Pumps - Wilo
Backup :SteibelEltronTempra 15 instantaneous electric hot water heater
TTi Flat Jack roof mounts
All hot water pipes insulated and as short as possible
Ventilation:
Two Fantech SHR 1505 142 CFM air to air heat exchangers
One in basement – services first floor, pulls from bathroom and kitchen, supplies living room
One in attic – services second floor, pulls from bathroom, supplies bedrooms
Controls: 20 minute pushbutton timers, flow switch in shower automatically turns system on
Venmar Transition Tandem exterior vent – only one hole required in outside wall
PV system
5.88 kW, 28 Evergreen Solar ESA210 Fa-3 modules
Estimated anual production 6,500 kWh, actual anual production 7,399 kWh
SolectriaPVI5300 grid tied inverter
Revenue grade meter
TTi Flat Jack roof mounts
Unirac SolarMount rails
Installation by Alteris - now Real Goods Solar

Radiant floor heat system (first floor only):
Roth ¾” radiant floor panels
One zone, six loops of 3/8 PEX tubing – in first floor only
8mm laminate flooring
controls: TEKMAR tN2 House Control 400 outdoor reset, networked thermostats
Caleffi manifold
120’ copper heat transfer coil in storage tank
Taco 009 circulator pump
Upstairs heat system:
1500 W electric fireplaces in each bedroom, rarely used
Windows:
Thermotech casement style, fiberglass, triple pane, argon filled, U value 0.19
Different glass with higher SHGC of .64 used on south side for more passive solar gain
No sloped glass
Double cell honeycomb shades
Doors:
Steel, insulated U.16
Appliances:
Induction cooktop
Highest rated Energy Star fridge and LED TV
Convection oven
Lighting:
No lights are needed during the day
2700K LEDS and compact fluorescents used exclusively
Performance:
Net positive – 3,146 kWh (Oct 12, 2011-Oct 12, 2012)
Warm in winter, cool in summer (without air conditioning)
Humidity level pretty constant around 35-40% RH
Quiet
Very little backup heat required, portable electric baseboard unit used very infrequently
328 gallon solar tank water rose 62 degrees in one day (March 5, 2011 – 64 degrees to 126 degrees)

Msc:
Ultra high efficiency Niagra Conservation Stealth toilets - .8 gallons per flush- work great
Delta low flow showerhead – 1.5 gallon per minute
Kitchen faucet flow shut off
Switched outlet reduces 23 Watt cable TV box standby loss
Quartersawn spruce rain screen siding