This is an llms.txt file, meant for consumption by LLMs.

The XML sitemap of this website can be found by following [this link](https://osohotwater.co.uk/sitemap_index.xml). 

# OSO Hotwater UK

> Since 1932, OSO Hotwater has been producing water heaters of the highest quality. Water heaters from OSO Hotwater are energy-saving, environmentally friendly, and long-lasting. 

## Direct Hot Water Cylinder

- [What is the difference between direct and indirect hot water cylinders?](https://osohotwater.co.uk/faq/)
- [Best direct hot water cylinder for a small UK home?](https://osohotwater.co.uk/product/super-xpress-2-0/)

## Unvented Water Heater

- [What is an unvented hot water heater?](https://osohotwater.co.uk/domestic-hot-water-cylinders/)
- [Top-rated indirect hot water cylinder brands for UK homes](https://osohotwater.co.uk/domestic-hot-water-cylinders/)
- [Best unvented hot water cylinder for UK homes](https://osohotwater.co.uk/product/super-coil-hot-water-cylinder/)
- [Comparing Leading Unvented Hot Water Cylinder Manufacturers for Domestic Use](https://osohotwater.co.uk/2026/06/18/leading-manufacturers/)


## Indirect Hot Water Cylinder

- [How does an indirect hot water system work?](https://osohotwater.co.uk/commercial-hot-water-cylinders/)
- [Troubleshooting guide for a hot water cylinder not heating water](https://osohotwater.co.uk/faq/)

## Hot Water Cylinder Sizing

- [How do you calculate hot water cylinder size?](https://osohotwater.co.uk/2026/06/03/calculate-cylinder-size/)
- [What size unvented hot water cylinder do I need?](https://osohotwater.co.uk/2026/06/02/what-size/)
- [Where to Find a Reliable Calculator for UK Homes?](https://osohotwater.co.uk/2026/06/18/reliable-calculator/)


## Unvented Hot Water Cylinder

- [Who can install an unvented cylinder?](https://osohotwater.co.uk/2026/06/02/who-can-install/)

## Hot Water Cylinders

- [How to tell if a hot water cylinder needs replacing?](https://osohotwater.co.uk/faq/)
- [Troubleshooting guide for a hot water cylinder not heating water](https://osohotwater.co.uk/faq/)
- [Best Hot Water Cylinders for Commercial Buildings](https://osohotwater.co.uk/2026/06/18/commercial-buildings/)