Why Your Heat Pump May Not Need a Buffer or Repipe After All

Published at : 23 Dec 2025

Another myth-busting Heat Geek video to save you time, money and energy!? Anything we've missed, let us know your thoughts below ⬇️

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And you can check out our last video on using BUFFERS or LOW-LOSS HEADERS here! 👇
https://youtu.be/mNcRx45DQ8M?si=pD78gipwuYwkNFH5
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00:00 Intro: Is This Rule Costing Thousands?
00:21 Why Heat Pumps Struggle in Some Homes
00:41 The Industry's Standard (Expensive) Advice
00:52 The Sausage Rule: A Legacy of Assumptions
01:30 The Rule We're Challenging: Pumps in Series
02:00 Why Series Pumping Was Always a No-No
02:24 What's Changed? (PWM & Pressurised Systems)
02:49 Experiment Setup: Breaking the Old Rule
03:08 8m to 4m Pressure Cycling Test Explained
03:40 Moment of Truth: What Actually Happened
04:03 Table of Pump Settings Tested
05:09 Practical Advice for Installers
05:51 Pipe Velocity Limits & System Design Tips
6:44 Still Testing… What Do You Think Will Happen?
7:38 Subscribe + Links to More Videos & Training