Why is the hot water produced by my combi boiler sometimes cloudy?
The water from combi boilers is heated directly from the mains, so the only time the water is released to the atmosphere is when it comes out of the tap. This means that during heating, the calcium bi-carbonate present in the water changes to calcium carbonate. This causes the creation of Carbon Dioxide which close up is seen as millions of bubbles, this is not sediment it's merely cosmetic. If you run some hot water into a glass and let it cool it will slowly clear. This phenomenon is more apparent in hard water areas and from models with perhaps slower and/or lower flow rates.
More Oil Boiler FAQs
- My new Greenstar oil boiler's flue overheat thermostat keeps tripping out
- Why might I want to programme hot water times with my combi boiler?
- How could mains water pressure affect my combi boiler?
- Do you recommend treatment of the central heating water?
- How does part L of the Building Regulations affect my boiler installation?
- What do the error symbols mean on my boiler?
- What can cause an oil boilers burner to lockout?
- Will I receive anything in writing when I have a new boiler installed?
- What sort of shower can I run off my combi boiler?
- Can I use artificially softened water in the heating circuit with my boiler?
Send enquiry
Send us an enquiry via our website and we'll get back to you as soon as we can.
Register guarantee
Register your Worcester Bosch product here by following a few simple steps.
Manuals & brochures
Lost the instructions? Don't worry. Download PDF copies of product user manuals, instructions or brochures here.
Customer support
Find out about our service plans and book your next appointment.
Customer relations
Please contact our customer relations team if you have any feedback, comments or criticism of our products or services.