Monday, August 17, 2009

Do we still need a Solar water preheater?

We are still wondering if it is worth having the solar water preheat tank at all now.
The GSHP will work so much more efficiently when the clay in the deep borehole is warmer that the cost of a separate solar thermal water preheater may not be justified.
DHW overall is only about 25% of the workload of the GSHP over the last 2.5 years. And it has only been 13% of the workload of the Immersion heater function in the heatpump.
It would completely confuse the data, because the obvious benefit it would give to the efficiency of the heatpump would make it difficult to decide how much efficiency had been added by Solar earth charging.

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