Bro has a system boiler which he'd like to replace with a combi. He's on the 5th floor of a building and the gas metres are at ground level.
The gas pipe route seems to be up the outside of the building for most of its way, then comes in and travels up to a 'room' on the roof where the system boiler was fitted last year.
I know that combi boilers consume more gas than conventional boilers when 'instantly' delivering their DHW, and I understand that determining the correct gas pipe sizing is usually done using calculations - length, bends, kW of appliances etc.
But is there any way for a GasSafe to actually measure the actual existing gas flow at the boiler to determine whether it's adequate for a combi? Eg - measuring the max deliverable flow from the pipe? Or are calcs the only way?
(I'm thinking that calcs could be long-winded in this case as following the pipe route is a bit torturous. And it's also a looong way; 5m to get from the front of the building to the back, 20m min going up to the 5th floor, back in to the flat, another few metres upstairs...)
All the flats below do appear to have had combis fitted (they've all had their CWS's removed from the roof), so presumably they've either had adequate pipe sizes from the off or have had them replaced.
If the existing pipe to the top flat is found to not be adequate, is the only answer to replace it with a larger pipe size, or can Transco(?) or similar 'tweak' the meter's output slightly?
Thanks.
The gas pipe route seems to be up the outside of the building for most of its way, then comes in and travels up to a 'room' on the roof where the system boiler was fitted last year.
I know that combi boilers consume more gas than conventional boilers when 'instantly' delivering their DHW, and I understand that determining the correct gas pipe sizing is usually done using calculations - length, bends, kW of appliances etc.
But is there any way for a GasSafe to actually measure the actual existing gas flow at the boiler to determine whether it's adequate for a combi? Eg - measuring the max deliverable flow from the pipe? Or are calcs the only way?
(I'm thinking that calcs could be long-winded in this case as following the pipe route is a bit torturous. And it's also a looong way; 5m to get from the front of the building to the back, 20m min going up to the 5th floor, back in to the flat, another few metres upstairs...)
All the flats below do appear to have had combis fitted (they've all had their CWS's removed from the roof), so presumably they've either had adequate pipe sizes from the off or have had them replaced.
If the existing pipe to the top flat is found to not be adequate, is the only answer to replace it with a larger pipe size, or can Transco(?) or similar 'tweak' the meter's output slightly?
Thanks.
