Considering a replacement boiler

[spacey3]

I have been helping my parents replace a very old boiler that died recently. This got me thinking and considering replacing our boiler.

We currently have a Worcester around 16 years old - I have read around about getting the home to be more energy efficient but installing more loft insulating, draft proofing the windows and dealing with all these items.

However, I wanted to find out how much more efficient a new condensing boiler would be and also changing from a combination boiler to a pressurised cylinder and a system boiler?

 

[dcawkwell]

Not much in it. Certainly not worth the cost.
You can install the cylinder and keep the boiler if what you are after is
more water delivery.
A combi can still heat an unvented cylinder.

 

[spacey3]

Thanks for the prompt response.

For clarity are you saying that I could install an unvented cylinder such as a Megaflow and run that off a combination boiler and don't need to change the boiler to a system one?

 

[dcawkwell]

Thanks for the prompt response.

For clarity are you saying that I could install an unvented cylinder such as a Megaflow and run that off a combination boiler and don't need to change the boiler to a system one?

Yep. A boiler is only heat source. Just need to direct the heat.
Heat underfloor, hot water tanks, anything you like.
If you plumber doesn't know how to do it show them the door.

 

[spacey3]

Would that be a Direct or Indirect cylinder with the combi?

 

[mickyg]

why do you want a cylinder? you was talking about being energy efficient, this will be less efficient. If your happy with current setup then leave alone

 

[spacey3]

Combi doesn't really meet our needs in the house and a cylinder would have better pressure for our needs and also more demand at any one time.

 

[mickyg]

have you checked your water pressure and flow?

 

[spacey3]

Yes, nothing wrong with it

 

[newbuildinstaller]

Best advice is to get a plumber out with G3 quailfications. You have been told you can use your combi as a heat source (which you can) but as for the rest you need a site visit.

(nothing wrong with it) isnt a technical evaluation of your water flow rate/dynamic pressure. You will need to find these out as there are minimum rates to make a UV system work well. If they are not met you may as well save yourself a couple of grand and keep your current set up

Also just checking you arnt hoping to DIY your UV cylinder??

Oh and direct cylinder means is heats its self (immersion heaters) indirect means another heat source is used (in your case a boiler) so you want a indirect cyl