In our 30 years of operation, Maritime Geothermal Ltd. has become very good at designing and building traditional water to water heat pumps that produce 120°F (48°C) hot water. For decades these heat pumps have done a very good job at producing hot water for radiant in-floor heating.
But often we have been approached by homeowners who need water that is hotter. These homeowners may have hot water baseboard heating or cast iron radiators, and they were looking for a heat pump that could produce significantly hotter water. Unfortunately, we did not have a heat pump that could produce water hot enough to guarantee a homeowner’s comfort with these distribution systems.
Introducing the new WC Series high-temperature hot water heat pump, with hot water output up to 160°F (70°C) from a geothermal ground loop or open water well.
Maritime Geothermal Ltd. has been manufacturing typical water to water heat pumps for years, and we tackled the design of the WC Series in response to the many inquiries we’ve received from homeowners, geothermal professionals, and architects and engineers.
This new heat pump was no small undertaking, fortunately, we had the skills and know-how on our team to make this heat pump a reality. We carefully designed, developed and tested this heat pump over the past year, and here is what our Product Design engineer, Dan Rheault, has to say about it:
Dual Refrigerant System
The WC Series is able to produce hot water up to 160°F (70°C) from source temperatures as low as 25°F (-4°C). It accomplishes this by using two refrigeration circuits, one with R410a and one with R134a refrigerant. The two refrigerant circuits allow this heat pump to accomplish the impressive temperature lifts required for high temperature heating.
The WC Series heat pump is equipped with our Gen2 control board. This control board has USB connectivity and is equipped with data logging. It is also BACnet capable and integrates easily with building management systems. The control board has built-in aqustat functionality so no external probes are required.
The Gen2 control board also operates the heat pump’s outdoor reset functionality. The outdoor reset feature only turns up the buffer tank temperature when outdoor temperatures drop, minimizing the amount of work the heat pump needs to perform to satisfy the home’s cooling load. This maximizes the heat pump coefficient of performance (COP) at all times.
Optional Dedicated Domestic Hot Water
The WC Series is also offered in a double wall heat exchanger version for dedicated domestic hot water heating. This option is available in sizes from 1.5 to 6 nominal tons. The 1.5 ton option is perfect for the average four-person family looking for a dedicated domestic hot water heat pump. The larger sizes are suited to domestic hot water production for commercial applications.
The WC Series has an average heat pump COP of between 2.1 and 2.8, depending on the temperature lift required. The lower the temperature of water required, the higher the COP. Fortunately, the built-in outdoor reset function will also ensure the heat pump is outputting the lowest temperature of water possible, continually maximizing your heating efficiency.
The WC Series heat pump is available in sizes 1.5 to 6 nominal tons. This unit is non-reversing so cannot provide air conditioning, and has no desuperheater.
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