Starting to get complicated, though, isn't it....
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17 years ago
Standard or "Superduty" hot water cylinder?
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17 years ago
If the cylinder has German insulation standards they heat loss is minimal. Levels in the UK are dire.
With adequate speading pipes in the cylinder this is not a big issue.
Yep, as Gledhill do.
Yep, put a 2-port valve on the primaries from the cylinder that serve the PHE and have a remote sensor on the DHW flow to the taps. Works well. Danfoss do a good one. You may need a pressure by-pass valve around the thermostat 2-port valve to cope when the valve is fully closed. There is also the Grundfoss Alpha auto variable speed pump too. Setting up is a bit tricky as it may fight with the DHW thermostat. I have seen a few work very well and no pressure by-pass valve needed.
Yep, and another valve eliminated that reduces flow. Another is the PRV too.
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17 years ago
No.
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17 years ago
Would you be willing to subsidise the extra cost??
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17 years ago
Matt, what are you on about.
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17 years ago
Meaning if you think it's not such a big deal, would you be willing to subsidise the installer for the additional cost of the components? Do you know what the additional cost, including the cost of diagnosing and replacing them as a result of failures during the system lifetime?
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17 years ago
Matt, you have to stop prattling bollocks. A 2-port remote sensor thermostat valve is not super expensive and it eliminates a TMV too.
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17 years ago
Another way is switch speeds of the DHW plate heat ex pump - Keston do this with a Grundfoss. Using two flow switches set at different flows can switch in the pump's speed. Low DHW flows and low speed, higher flows and the high switching flow switch cuts in and a faster speed. Simple and effective.