Hello to everyone, I have just registered on this site and this is my first posting.
I am a very practical person and have built a new extension to my home. I am not a plumber or an heating engineer, although I do have a practical abilities for both. I do not have a technical knowledge especially on the heating installation side. I am aware that the engineers must be registered with Gas Safety.
I am looking for guidance as I am getting conflicting advice from the heating engineers who have visited the installation site.
This is my home specification;- I am installing a complete new CH system, boiler, radiators and pipe work, plus hot and cold water supplies to all the outlets in my home. I have 2 en-suites, 1 bathroom, 6 bedrooms over 3 levels in to the loft, a kitchen & utility room, downstairs w/c and 20 rads in total. I have a new mains water pipe into the house with a F/R 25 litre + & 1.75 bar pressure. I intend to install the boiler plus and additional tanks etc in the garage.
I liked the idea of installing a Worcester Bosch combination boiler because it meant I don't have a large tank of hot water sitting in the garage.
I wont reel off all the different sizes of boilers etc I have been told are adequate but it finally got to this model the Greenstar Highflow 550CDI/i combination boiler, their biggest.
Then one of the engineers told me because of the size of the property and its demands on the system it would require these additional items installed to make sure it operates correctly. They are a Low Loss Header, a Grunfos Magna 25-80 pump to work on the heating side and a 18 litre expansion vessel. None of the other engineers seemed to be aware of this LLH and set up and one of them I got from the WB web site said I didnt need it.
I ask Worcester Bosch technical their opinion and this is their reply.
"With the bigger boiler the central heating system is still limited to 30kw the increase in performance is purely on the hot water delivery. The secondary pump should not be bigger than the pump in the boiler, so should be no bigger than a 15/60, if the pumps either side of the low loss header are not balanced then you may not have an even heat spread across the system".
Now they give conflicting opinion as to the size of the additional pump which makes me question the engineer who said I need these extras in the first place.
My question to anyone who can help, is, help!!!
Do I need all these extras to make this boiler function correctly?
Is a combination boiler the right boiler for this size house or should I have a sealed system with a hot water (Megaflow) storage cylinder for this size property?
Any replies would be welcome as it all very confusing.
I am a very practical person and have built a new extension to my home. I am not a plumber or an heating engineer, although I do have a practical abilities for both. I do not have a technical knowledge especially on the heating installation side. I am aware that the engineers must be registered with Gas Safety.
I am looking for guidance as I am getting conflicting advice from the heating engineers who have visited the installation site.
This is my home specification;- I am installing a complete new CH system, boiler, radiators and pipe work, plus hot and cold water supplies to all the outlets in my home. I have 2 en-suites, 1 bathroom, 6 bedrooms over 3 levels in to the loft, a kitchen & utility room, downstairs w/c and 20 rads in total. I have a new mains water pipe into the house with a F/R 25 litre + & 1.75 bar pressure. I intend to install the boiler plus and additional tanks etc in the garage.
I liked the idea of installing a Worcester Bosch combination boiler because it meant I don't have a large tank of hot water sitting in the garage.
I wont reel off all the different sizes of boilers etc I have been told are adequate but it finally got to this model the Greenstar Highflow 550CDI/i combination boiler, their biggest.
Then one of the engineers told me because of the size of the property and its demands on the system it would require these additional items installed to make sure it operates correctly. They are a Low Loss Header, a Grunfos Magna 25-80 pump to work on the heating side and a 18 litre expansion vessel. None of the other engineers seemed to be aware of this LLH and set up and one of them I got from the WB web site said I didnt need it.
I ask Worcester Bosch technical their opinion and this is their reply.
"With the bigger boiler the central heating system is still limited to 30kw the increase in performance is purely on the hot water delivery. The secondary pump should not be bigger than the pump in the boiler, so should be no bigger than a 15/60, if the pumps either side of the low loss header are not balanced then you may not have an even heat spread across the system".
Now they give conflicting opinion as to the size of the additional pump which makes me question the engineer who said I need these extras in the first place.
My question to anyone who can help, is, help!!!
Do I need all these extras to make this boiler function correctly?
Is a combination boiler the right boiler for this size house or should I have a sealed system with a hot water (Megaflow) storage cylinder for this size property?
Any replies would be welcome as it all very confusing.
