Everything you need to know about hot tub pipe before you order: imperial vs metric sizes, what sizes a DIY tub needs, pressure ratings in hot water, rigid vs flexible, and testing.
Air Source Heat Pump Related
Comfortline Heat Pump Review (2026): The Air Source Heat Pump on My Own Hot Tub
07
Jun
Jun
The Comfortline inverter is the air source heat pump on my own hot tub. Here’s the current 2026 range, the specs that matter, and how it has performed for me, cold weather included.
Case Studies / Example Projects, DIY Hot Tub Building
My Hot Tub Control Room Remodel: What I Changed and Why
22
May
May
The control room was the part of my own hot tub I was least proud of. Here’s how I rebuilt it, what the heat pump did to my running costs, and what I’d do today.
Air Source Heat Pump Related, Support & Maintenance
How I Cut My Hot Tub Running Costs by 66% with an Air Source Heat Pump
19
May
May
My before-and-after smart meter figures from fitting an air source heat pump to my DIY hot tub: heat-up, use and weekday costs, what it would cost at today’s prices, and how quickly it paid for itself.
Cocktail & Plunge Pool Related, Design / Ideas Related
Pool and Hot Tub Plumbing: Why They Should Stay Separate (and What You Can Share)
16
May
May
Why you can’t just add jets to a pool pump, where sand filters and variable-speed pumps fit, and how to share a heater or build a spillover spa properly.
Air Source Heat Pump Related
Why I Fitted an Air Source Heat Pump to My DIY Hot Tub (and How I Plumbed It In)
15
May
May
Why I added an air source heat pump to my own slow, expensive DIY hot tub, and how I fitted it with a separate pump loop and relays without drilling any new holes in the shell.
Case Studies / Example Projects, DIY Hot Tub Building
Inspirational DIY Hot Tubs: Customer Build Updates (Video)
07
May
May
A video round-up of customer DIY hot tub builds in progress, plus the stages every build goes through and more case studies to inspire your own.
Air Source Heat Pump Related, Support & Maintenance
How I Added an Air Source Heat Pump to an Existing Hot Tub (Paul’s Acrylic Tub)
27
Apr
Apr
Step by step, how I fitted a 7kW air source heat pump to my friend Paul’s new acrylic hot tub: the location, electrics, plumbing, bypass, testing, and what it did to his heat-up times and running costs.
DIY Hot Tub Building, Support & Maintenance
Can You Control a Swimming Pool Light with a Hot Tub Spa Pack?
08
Apr
Apr
Spa pack light outputs are too small for a proper pool light. Here’s why, what Balboa and Gecko packs actually supply, and how my connection kit lets your topside switch a pool light on and off.
10
Mar
Mar
A general contractor can build you a great hot tub, but the plumbing is where it goes wrong. Here’s how to choose, contract, pay and check a builder in the UK and USA.