Range Rating Worcester Greenstar 4000 24kw Energy Saving Advice

[CountChimpula]

Hi folks,

First post here.

Currently in the process of looking at all energy saving advice and tips. Watched a lot of videos on "Range rating your boiler". Have to admit to being totally confused by the whole thing. Most of the advice comes from plumbers who seem to think us mere mortals understand what they are saying ;o). And sometimes there is completely contradictory information on the same subject.

I have a Worcester Greenstar 4000 24kw. House has 9 radiators in total. Using the online advice to find the secret installer menu, and heading to the correct sub menu, I can see my boiler currently has a setting of 80% in the Max Heat Output menu.

I've heard that the greenstar is capable of up to 15 radiators. What kind of percentage would I need for my house of 9 radiators. Anyone with a similar setup who has experience with this?

Many thanks.

Count Chimpula.

 

[Harry Bloomfield]

I have a Worcester Greenstar 4000 24kw. House has 9 radiators in total. Using the online advice to find the secret installer menu, and heading to the correct sub menu, I can see my boiler currently has a setting of 80% in the Max Heat Output menu.

My understanding, is that range limiting will help prevent the boiler over-shooting the demand, too rapidely. It will also save fuel, if it avoids the boiler lighting up on too high an output, and generating too much heat. To fine tune it, just keep turning the value down, until in the coldest weather, it responds adequately, in providing the heat you need.

Long, slow burns, are more efficient than rapid heat up, then short on/off's.

 

[CountChimpula]

My understanding, is that range limiting will help prevent the boiler over-shooting the demand, too rapidely. It will also save fuel, if it avoids the boiler lighting up on too high an output, and generating too much heat. To fine tune it, just keep turning the value down, until in the coldest weather, it responds adequately, in providing the heat you need.

Long, slow burns, are more efficient than rapid heat up, then short on/off's.

Thanks Harry. Obviously in the summer, its not a problem. In the cold weather I will turn the value down and see what happens. Many thanks.

 

[Harry Bloomfield]

Thanks Harry. Obviously in the summer, its not a problem. In the cold weather I will turn the value down and see what happens. Many thanks.

24Kw sounds a bit oversized, for 9 radiators, unless they are all quite large ones. Mine is 18Kw and still to big for 9 rads..

 

[CountChimpula]

24Kw sounds a bit oversized, for 9 radiators, unless they are all quite large ones. Mine is 18Kw and still to big for 9 rads..

Some are quite large. Bathroom and toilet small ones. I think you are quite right in your assessment. I wish there was a simple formula based on number of radiators and size etc. Seems there is an art to tweaking in just right.

 

[muggles]

I go on a rough rule of thumb of 1kW per radiator as a starting point so you need about 9kW. Wind it down to 50% (which is the lowest that Worcester will allow you to go) and it'll be fine

 

[CountChimpula]

Thanks, ill give it a try

 

[CountChimpula]

Do you know if the range rating affects the hot water to, or is it just for the central heating?

Cheers!

 

[Johntheo5]

If its a system boiler then both can be range rated separately but don't know if both can be selected on together and if so which range rating applies.