At Adveco, we are proponents of systems that offer drain-back, which as the name implies drains the solar fluid from the collector to a reservoir when not in use, allowing for a system to be safely off.
A drain-back vessel located in the plant room is one option, that will also allow for pipework fluid, but will require greater head pumps.
With Adveco’s flat plate collectors, featuring integrated drain-back module, commercial buildings with high demands can deploy a large number of collectors with a small tank and still provide high-temperature water with the knowledge that in times of low use high-temperature build-up in collectors is impossible. This ensures the system remains protected. This approach is also more cost-effective as there is no requirement for installation of large solar storage, and more efficient as there is no call to dump unused heat.