Should I Retrofit or Upgrade My Pipework for a Heat Pump?

Pipe sizing isn’t just technical jargon... it’s one of the most overlooked factors in heat pump performance. In this must-watch episode of Homeowners’ Q&A, we dive into the real-world consequences of undersized pipework, especially in retrofits and microbore systems. Guests Mark Parker, Mark Hall and Brendon Uys bring years of hands-on experience to the table exposing common pitfalls, sharing retrofit design wisdom and exploring how homeowners can avoid costly mistakes. Thank you to Elite Renewables for sponsoring this episode: https://www.eliterenewables.co.uk To find out more about the FRV (Flow Regulating Valve) product discussed in this video, please visit: https://renewableheatinghub.co.uk/the... To get a 10 discount on the FRV just email us [email protected] and we’ll send you the discount code. Buy Bodge Buster: Heat Pump Guide for Homeowners: amzn.to/3NVndlU Buy From Zero to Heat Pump Hero: amzn.to/4bWkPFb 🔗 Subscribe for more episodes and check out our website at Renewable Heating Hub for resources and advice: https://renewableheatinghub.co.uk Don’t forget to subscribe for more expert discussions on renewable heating: https://renewableheatinghub.co.uk/forums If you would like to sponsor an episode or be a guest on our panel, please send an email to [email protected] 🌿 FOLLOW US HERE 🌿 Renewable Heating Hub: https://renewableheatinghub.co.uk Renewable Heating Hub Forums: https://renewableheatinghub.co.uk/forums YouTube:    / renewableheatinghub   Instagram:   / renewableheatinghub   Email: [email protected] Got more questions? Comment below or email us at [email protected]. Don’t forget to subscribe for more episodes! 00:00 Intro 01:38 Why pipe sizing really matters in low-temperature systems like heat pumps 03:41 How Mark Hall approached pipework design in his 300-year-old home 06:49 Can old pipework be reused? What to do when you don’t know what’s behind the walls 09:00 Why are large primary pipes still needed when they feed into smaller branches? 10:18 Understanding pump head and why it’s often misunderstood 10:53 Why pump head on the heat pump side is irrelevant if you’ve got hydraulic separation 13:01 Designing pipework and radiator layout from scratch: what to prioritise for heat pump efficiency 19:33 How critical is radiator balancing to achieving efficient heating? 22:42 Are buffer tanks being used to hide poor system design and unbalanced circuits? 24:58 How much should homeowners and installers focus on balancing for long-term performance? 28:04 Will new technologies like the FRV help solve issues with cold circuits and poor balancing? 29:21 Can microbore pipework actually work with heat pumps? Let’s talk real-world experience 39:23 Is it possible to run an open-loop heat pump system using microbore pipework? 41:25 Why don’t some radiators ever get hot? How poor pipework design affects performance