Weber says, "When the ground extraction is from an array of drilled holes the depth is generally about 200 feet. Making a vertical array shrinks the footprint of the ground loop array, but it's more expensive to go vertical because the drilling cost is higher than the cost of excavation." Weber maintains that the expense may be higher but the process remains feasible. "With specialization in the drilling equipment and process the cost is coming down a bit. Unlike a water well hole you only drill about 5 inches wide. The pipe goes down and there are two u-shaped bends that return the ground-heated water to the heat exchanger."
He adds, "In the horizontal array you go below the frost-line, sometimes as deep as eight feet, depending on the climate. Either system is returning ground heat to a NextEnergy geothermal heat pump." The heat exchange units carry a 10 year warranty on the machinery, one of the most comprehensive in the industry. NextEnergy is a strong advocate of complying with industry standards making sure all the installations are done by the right people. "NextEnergy personally hand picks our certified contractors and put them through a rigorous selection process before we sign them on. They are all trained and certified by our in-house experts."
Weber says, "These are all independent contractors working in a period of unbelievable growth of this technology." The company's network of installers is setting the bar. He notes that current federal and provincial incentives permit up to $9,000 to be invested in green energy solutions by householders in some provinces, although different circumstances probably apply to Indian Reserves, where the Canada Economic Action Plan is currently underway.
"Geothermal is basically solar energy because the sun heats the earth and pipes are extracting the heat," says Weber. "The systems use 3/4 inch plastic pipe looped in an array that runs across an excavated area to create the energy source. Calculations are based on the size and heat loss of the house, ground conditions and climate. The flow of the loop is controlled by a flow-centre monitoring system mounted on the wall." The regulated flow applies to individual circuits and the flow conducts through the acreage or you can do a pond loop to extract heat from the water. Ground loops can also be pre-arranged in subdivisions by the developer. There are geothermal subdivisions like Sun Rivers in Kamloops, BC.
Ground Source Drilling Ltd. is expert in geothermal drilling for residential and commercial purposes. "We are based in Kelowna, B.C., and serve many locations throughout both B.C. and Alberta," says Lori Faasse, general manager. They are geothermal drillers only, "Specializing in this one field allows us to be extremely competitive in our pricing. Our drillers are certified through the BC Ministry of Environment and all of our drill rigs are successful at working in many different mud and air rotary conditions. We have good working relationships with many regional heat pump installers. We can work directly with you or through your installer and if you do not have a geothermal system installer we can assist you in finding one. We want to help you meet your geothermal goals."
The company is a family-owned and operated business with many years of experience in the drilling business. "Drilling holes for geothermal is different depending on the area. You will have to drill to 300 feet maximum in some areas, but on average the depth of hole is about 200 feet," says Faase. "The number of holes to be drilled depends on the ground type involved and the size of the house to be heated." Ground Source Drilling does the drilling for Sun Rivers Construction in the award winning Kamloops subdivision that leads with innovation in 'greening' their community, in part by building geothermal heating and air-conditioning systems into their house construction since 1999.
"Our drilling for them is on-going and it continues to be a show-piece housing development in geothermal construction. The drilling portion of a geothermal/geo-exchange installation costs anywhere between $8,000 and $15,000 for a house, depending on the size of the house and the number and depth of holes in the array of drilled ground loops." Faase says there are a few areas in the province where you can't do a geothermal installation because the cost of drilling becomes prohibitive, but they work in B.C. and Alberta installing these ground loops and, "usually the first test holes will prove it."
Progressive Geothermal Ltd. is a geothermal installation company that operates out of Kitimat, B.C., "I've been installing geothermal and geo-exchange systems in the North West Coast for the past three years," says Paul Silvestre, the principle of the company that installs Nordic Canadian heat exchange systems designed and built in Petitcodiac, New Brunswick. "I trained on the installation of geothermal systems in Calgary and did residential and designer installation courses. It was a two-week course and I went into it as a journeyman heavy-duty mechanic."
He liked the concept from deciding on the heating method to be installed on his own property. "Retrofits are definitely do-able. I would typically go to an engineering firm and design the system based on the heat-loss calculation of the building," says Silvestre. "I would do a site visit and check the age of the building, the walls and windows, the type of insulation, and we would determine the number of BTU's required to heat the building."
Silvestre says the northern reaches of B.C. where he lives and works contains many communities that are diesel dependent for their heat, and it might well be electric heat. "They need electrical energy to heat the water in their houses. Cost efficiencies would be found in extracting heat from the ground for houses instead of burning diesel to create electricity to heat houses."; while heat exchangers require electricity the electrical demand on the diesel generator would drop by a significant amount.
"I've done vertical systems where the pipes are laid into drilled holes, and I've done horizontal arrays in the Kitimat region." Silvestre says it takes about a day and a half to install a slinky coil horizontal loop of about 100 feet by 50 feet with a depth of about 6 to 8 feet, depending on the soil. "The loops of slinky coil use a lot less ground area and reduced excavation brings down costs." The loops contain a solution or water to extract the earth's heat which is circulated through the Nordic heat exchanger, and "You're not losing effectiveness with a properly coiled horizontal ground loop. The more expensive way comes when drilling an open loop at $40 per foot down two wells to the required depth." The depth varies depending on the availability of water whereupon one well extracts the water for the heat exchanger while the other well returns source ground water to the aquifer.
Silvestre refers next to the closed loop method of extracting heat from the earth, "It's called the closed loop of multiple wells joined at the 'header' that can be located in the basement of the building and this header has multiple valves to control circulation from the wells." The heat exchanger will generate four tonnes of 'refrigeration' power which is enough to heat or cool a 2,000 sq ft house. A Nordic unit of the required size costs between $4,500 and $5,000. "The most expensive aspect of a geothermal installation is the excavation or drilling for heat extraction."
Regarding the expense of design and installation of geothermal systems, it is the rising cost of hydro and natural gas (and the cost to install natural gas lines) or burn diesel or propane that should be factored into the investment. "There is also the reduction of green house gases and the quiet way of heating the system affords." At his location on the Pacific coast there are communities that would be able to install ocean loops as the way to extract the constant heat of the ocean water. "For some communities there may be added cost because of government regulation and worries about losing the loops to an active fishery. Hartley Bay is a community right beside the ocean and they installed a horizontal ground loop system," partly because it was safer in consideration for their active fishery in immediate vicinity of their village on Hecate Strait.
Greenray Geothermal has been installing geothermal energy systems for the past four years along the Sunshine Coast of B.C., doing installations from Gibsons to Pender Harbour. Joe Fleischer a Next Energy dealer who became a certified installer with Canadian GeoExchange Coalition certification. Fleischer says Canada has variety in the opportunities to employ geothermal and geo-exchange technology to heat homes and save on energy consumption and reduce greenhouse gas emissions, "Ocean loops are popular forms of extracting geothermal energy on the west coast," a system of pipes that extracts the constant heat in the ocean to be used for house and hot water heating or air-conditioning in the summer.
He notes this form of heat extraction can also be achieved from lakes or ponds, "Ocean loops and geo-exchange arrays in lakes and ponds are very compact, 10 feet by 25 feet of coiled pipe will supply 4,000 tonnes of extractable heat energy." (1,000 tonnes of geothermal energy is the equivalent of 24,000 BTUs ant that is enough 'heat exchanged energy' to make a tonne of ice in 24 hours.)
The application of this energy source is becoming more common every day, "The new BC Ferry terminal at Departure Bay is heated and cooled by geothermal extracted by ocean loop." Ocean loops are unobtrusive and highly efficient both in extracting energy for minimal cost but also for the low cost of installation. An array of pipes can be arranged under a dock or pier and the energy extraction process can proceed with either water or methanol or ethanol propoline glycol flowing inside the geo-exchange array of loops. "The ocean has so much thermal mass that it efficiently pays for itself." Fleischer says ocean loops are efficient and affordable.
Horizontal ground loop arrays are put in the ground usually less than 8 feet deep beneath an excavation, "Sechelt First Nation put an underground geothermal array, known as a ground loop, to feed heat energy into five houses." Elsehwhere he says the method in the City of Vancouver is usually to drill from 150 feet to 300 feet to extract heat energy from the earth. "It costs about $15 a foot to drill the holes where it is a feasible ground heat source and one hole will supply 1,000 tonne of geothermal energy so it takes four holes to heat and cool a 2,000 square foot house and supply hot water." Sound proofing around the heat exchange unit makes for a quiet that surpasses air blown furnace heat.
Fleischer recently did a geo-exchange installation in Powell River on the Sunshine Coast, and says, "I'd like to get involved with training some people to do geothermal because the demand for installations is growing." There is presently a shortage of installers." Geothermal companies need people qualified to install it, "and it's a physical job," with excavations usually done by hired contractors, then, once the pipes are laid, there are pressure tests to conduct on pipes that are arrayed in tight concentric loops.
Pipes are warrantied for 50 years. They call geothermal taking heat from the lap of mother nature, "It's a pure form of heat unlike combustion furnaces that exceed 180 degrees of burning temperatures," literally frying the dust that is blown into the house, and geothermal extraction can come from creative thinking and new sources, "There is a trend in the US toward tapping municipal water systems for their geothermic mass."
Jim Croken has been installing geothermal and geoexhange systems in the Okanagan region of B.C. and beyond for the past ten years, and his son Nick has taken an educational pathway into mechanical engineering that will take the family business much farther than Jim might have imagined. Nick is a believer in the geothermal business, knowledgeable enough to write a scholarship-winning treatise about a unique geo-exchange project that took a different tack. Geothermal requires a heat source, water or ground, and these sources equal amazing cost efficiencies in the production of heat energy. Nick studied a geo-exchange project that took heat from the milk extracted from cows and returned it into barn heat, producing ideal conditions for milking in all seasons.
"I built my house ten years ago when I was an electrical contractor," says Jim, "The gas company informed me that it would cost $10,000 to get a gas-line to my house." Jim started doing the research and discovered a business opportunity that fit nicely within his skills and business sense. Soon he was building an enterprise around what seemed like a simple solution for his own purposes. Since then he's done over 200 installations from the Okanagan to Fort St. John, including everything from residential to agricultural (dairy barns, chicken coops) and multi-family dwellings, like 30 unit condominiums. "We target our business opportunities that are off the natural gas grid and those are a lot of places in B.C., including most of the territory east of Revelstoke. 
