3010207c__Apricus_vs_Hills___ClearChain__Difference
[Hills] Supplied [Apricus] Not Supplied [Comment] As discussed with a representative from Energymatters hills use a flow rate limiter where as Apricus do not. The rep. indicated the limiter was an important part of the system to make sure that the full efficiency was obtained from the collector. This didn’t sit well with me. Why when you have a pump moving water around would you want to slow it down? This puts pressure on the pump and makes it more likely to fail. Further investigation indicates it is due to the manifold design. The hills manifold is designed to hold 1.7l of water at a time, the apricus only 0.7l (30 tubes). Hence Hills needs the flow limiter as there’s more water to heat at any time. Apricus on the other hand is putting the same heat into less water, hence don’t need the limiter. 1. Until just the last couple of week the flow meter were NOT watermarked hence Apricus has not been allowing their use as we adhere strictly to the Australia Standards. Now they are finally certified Apricus is investigating making them a standard part of the system. 2. It should not be used to SLOW the water but rather to allow the actual flow rate to be observed and if too slow a faster speed on the pump can be chosen (if using a 3 speed pump), Apricus would not suggest restricting the flow rate by more than 25% otherwise it is effectively wasting electricity by artificially increasing the head pressure of the solar loop and forcing the pump to run longer each day. [Difference] 
Flow Rate Limiter
Solar Hot Water - Evacuated Tubes - Apricus vs Hills - ClearChain
Difference