Boiler and hot water tank
Can you have a hot water tank with a combi boiler?
A combination or ‘combi’ boiler is both a high efficiency water heater and a central heating boiler in a single compact unit. Combi boilers heat water directly from the mains when you turn on a tap, so you won’t need a hot water storage cylinder or a cold water storage tank in the roof space.
How does a boiler and hot water tank work?
The boiler heats the water and sends it to a cylinder, and then on to the central heating. On its way it heats, in the cylinder, via a very efficient heat exchanger, the mains fed water for the taps. An integral feed and expansion tank can be incorporated on top of the main tank.
What are the disadvantages of a combi boiler?
Because combi boilers take water directly from the mains supply if more than one person is showering simultaneously there can be a decline in water pressure. Older properties with original pipework may not be able to handle the higher pressure water and therefore would not be suitable for a combi boiler.
Are system boilers expensive to run?
System boilers are more complicated since they include some of the components required in an unvented system. This means that they are more expensive than regular boilers, and they will also take up more space when they are installed.
How do you know when a hot water tank is full?
Turn off the drain valve once the water runs completely clear. Let your water tank fill up. You’ll know when your water tank is full when the hot water tap, which you turned on earlier, runs normally without any residual air coming out. Turn off the tap.
How often should you need to Repressurise a combi boiler?
How often should you re-pressurise a combi boiler? There isn’t a specific timeframe that states when you should re-pressurise your combi boiler. You should re-pressurise it when the pressure has dropped to below 1 bar. This indicates that water has been lost from the system and needs to be replaced.
What is boiler efficiency?
Definition of Boiler Efficiency is “The percentage of the total absorption heating value of outlet. steam in the total supply heating value.” In other word, it is a rate how the boiler runs efficiently.
What is the alternative to a combi boiler?
Hybrid heating systems combine your gas boiler with a heat pump. This means you can make the switch to heat pumps without having to replace your boiler. A recent government report shows that a hybrid air source heat pump can reduce your boiler usage by up to 80%.
Is a combi boiler suitable for a 4 bedroom house?
For a medium to large 3-4 bedroom house with up to 15 average size radiators, 1 bathroom and an ensuite* bathroom, a 28-34kw Combi Boiler would be installed. A 35kw and a 42kw Combi boiler would be for a large house with anything up to 20 average size radiators and 2 bathrooms*.
Do all new boilers have to be condensing?
Do all new boilers have to be condensing? Because of the building regulations now in place, the vast majority of new gas and oil boilers have to be condensing models. However, there are occasional exceptions to this rule. In rare cases, a condensing boiler may not be a viable option in a particular property.
Can you get a grant for a new boiler?
Under the Governments ECO Scheme in 2020, qualifying home owners could have their old in-efficient boilers replaced completely free of charge, or heavily subsidised via a new boiler grant. If you qualify, we can arrange for a local, approved company to contact you to complete the installation of your new boiler.