Heating Systems Information | Dwr Cymru Welsh Water
Dwr Cymru Welsh Water

Monday, 17th February

With flooding still affecting many communities in Wales and Herefordshire, we are experiencing high volumes of calls due to the high winds and heavy rain and our crews are extremely busy.

Here are the organisations you may need to contact:

Natural Resources Wales - 0800 80 70 60 (24 Hours) - if the flooding is coming from a watercourse (such as a stream) that is about to or has burst its banks.

Your Local Council – if you suspect the flooding is resulting from rising groundwater or surface water run off.

Welsh Water Sewerage Services & Emergencies - 0800 085 3968 (24 hours) or report an issue via a webform – for flooding inside your property caused by a blocked or overloaded sewer.

My Water Cold Weather Heating Systems Information

Heating Systems Information

ADVICE - Heating Systems information

Different types of heating system need looking after in different ways in the event of a water supply failure. Check what type of system you have and follow the advice below.

Any heating system with a cold water storage tank and hot water cylinder 

If you have a heating system which uses a cold water storage tank (usually in the attic) and if the water supply is cut off, but your cold water storage tank is full, it’s safe to run your central heating. However, you should not use your hot water. A system with a cold water storage tank may give a limited amount of hot water after the supply is cut off, but you risk running the storage tank dry. If that happens it will create an airlock when the water comes back on again, so don’t be tempted. 
If your cold water storage tank has run dry, do not use your central heating or your hot water as this could cause your hot water cylinder to collapse.

Combination boiler 

If you have a combi boiler (where your hot water is heated directly form the gas boiler and you don’t have a hot water cylinder) you can use your heating, but you must not use any hot water from the taps. 

Economy 7 

If you have Economy 7, turn the immersion heaters off 

Solid fuel/ oil central heating system 

If you have a back boiler on your fire (i.e. if your fire heats water or radiators in your home) do not light your fire while the water is off. Once the water supply has been restored, light only a small first at first. 

If you are unsure of anything at any time contact a qualified heating engineer