Pump sizing is about flow and resistance, not horsepower alone. Learn the 10 GPM per jet rule, why pipe size matters and how to use a pump curve.
Category Archives: DIY Hot Tub Building
This blog covers everything you need to know about building your own DIY Hot Tub. From planning to plumbing, I cover it all.
Design / Ideas Related, DIY Hot Tub Building, Plumbing Related, Support & Maintenance
What Is the Best Way to Heat a DIY Hot Tub? (2026 Running Cost Comparison)
12
Dec
Dec
Electric, air source heat pump, gas, heat exchangers, wood and solar compared: what each really costs per unit of heat at today’s UK and US prices, how fast they heat, and which one I’d fit to a DIY hot tub.
12
Dec
Dec
DIY Hot Tub Heater – which one should I choose? How you heat the hot tub can ultimately affect how you use it and how much it costs you to run your tub. As I am sure you have realised, this blog and my YouTube Channel focus on DIY Hot Tubs and Pools. Hopefully, in this article, I can explain some of the options that you have for your DIY Hot Tub Heater.
DIY Hot Tub Building, Materials and Construction Related
Hot Tub Steps: Types, Heights and How to Build Your Own
11
Nov
Nov
Basic, storage and handrail hot tub steps compared, plus how to build your own DIY steps with the right rise, tread and non-slip finish.
Design / Ideas Related, DIY Hot Tub Building, Materials and Construction Related, Plumbing Related
Hot Tub Control Room Design: Distance, Height, Size and Layout
06
Nov
Nov
Where to put a hot tub control room and how big to make it: distance, elevation, space for equipment, services and maintenance.
30
Oct
Oct
Jeffrey and Dave in Tennessee are building their hot tub with ICF blocks. Here’s the foundation, the ICF walls, the control room and the concrete pour.
Design / Ideas Related, DIY Hot Tub Building, Plumbing Related
Hot Tub Pump Union Sizes Explained (With a Collar Size Guide)
30
Oct
Oct
Hot tub pump union sizes are named after the pipe they fit, not the collar you measure. Here is how to pick the right one.
DIY Hot Tub Building, Materials and Construction Related
How to Find a Replacement Hot Tub Headrest, Cushion or Pillow
26
Oct
Oct
Finding a replacement hot tub headrest can be tricky. Here is how to measure, match fixings and choose a generic one that fits.
Design / Ideas Related, DIY Hot Tub Building
How to Use a Venturi System Instead of a Blower on a Block Hot Tub
24
Oct
Oct
A step-by-step guide to running gunite jets on venturi air controls instead of an air blower on a block, concrete or ICF DIY hot tub.
23
Oct
Oct
Spa pack died or due an upgrade? Here’s what to check before you buy a replacement: topside compatibility, outputs, voltage, heater size and plumbing.