Efficiency Killer? Are Buffer Tanks Costing You More Than You Think?

Are buffer tanks doing more harm than good in heat pump systems? In this episode, we explore whether they are a necessary component or an outdated design choice that reduces efficiency.

Our expert panel includes: Leah Robson (Your Energy Your Way), Mario Dodic (Heat Pump Consultant, Trainer & Engineer), Brendon Uys (British Gas Net Zero) and Neil Sawers (Grant).

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0:00 Intro
2:59 What’s the Difference Between a 4-Port Buffer, 3-Port Buffer, and Volumiser?
4:56 What is Hydraulic Separation in a Heating System?
5:44 What is a Low Loss Header?
7:09 Why Do 4-Port Buffer Tanks Have a Negative Effect on Domestic Heat Pump Systems?
12:03 Should Manufacturers Continue to Pressure Installers to Fit Buffers?
16:21 How a Volumiser Can Look Like a Buffer Tank
17:37 What is Distortion in a Buffer Tank, and What Does It Actually Do?
19:18 How Many Grant ASHP Units Come with Modulating Pumps on the Heat Pump Side?
20:46 Are There Measurable Differences in SCOP Between Systems With and Without Buffer Tanks?
21:23 Impact of Circulation Pump Speeds on Inefficiencies in Systems with Buffer Tanks
23:08 How Should a 4-Port Buffer Be Correctly Piped with Flow and Return Pipes?
25:47 What Should Homeowners Do If They Receive Different Quotes (Some with Buffers, Others Without)?
26:54 Does Distortion/Blending Increase as the Size of the Buffer Tank Decreases?
28:25 Why Aren’t Installers Getting the Education They Need to Fit Systems Better?
29:04 Why Aren’t Volumisers Being Fitted More Often Than Buffer Tanks?
31:30 How Do You Tackle Properties with UFH and Radiators Requiring Different Flow Temperatures?
33:24 What is an Open Loop Heating Design?
36:18 Why is Balancing a 4-Port Buffer Correctly So Difficult?
37:27 Homeowner’s Question: Using Buffer Tanks to Prevent Cold Water from Entering Heat Emitters
39:04 Where Should a Volumiser Be Installed – On the Flow or Return?
40:23 Will Buffer Tanks and Heat Pumps Become More Popular with Smart Switching Electricity Tariffs?
43:46 How Do You Tackle Properties That Are Too Big for a Conventional Heat Pump and Circulation Pump?
46:44 Conclusion