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Post by endfeed on Dec 13, 2020 20:22:10 GMT
 .from the left hand side of picture is hot and cold, next to it is redundant 22 mm old flow and return, then moving over to the 3rd void is flow and return from combi boiler in 15mm no 22 at all? I believe a open vented got taken out and replaced with combi boiler, but why the hell would they have ran it all in 15mm?  |
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Post by tomplum on Dec 13, 2020 20:37:06 GMT
they were undisaplined cowboy plumbers gypos after a quick kill, they weighed in 22mm and reinstalled 15mm, 'orrible twats,  |
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Post by endfeed on Dec 13, 2020 20:51:19 GMT
The weird thing is tom it's still there 😂.
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Post by woodbine66 on Dec 13, 2020 23:45:35 GMT
Suppose it depends how many rads/BTUs it's feeding. Two or 3 smallish rads may be ok on 15mm, but for a normal house with usual amount of rads it's never going to heat them. Very rough guide is 15,000 BTU max output of rads on 15mm F&R.
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Post by rocketmanbkk on Dec 14, 2020 8:03:48 GMT
Saving a few quid
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Post by endfeed on Dec 14, 2020 17:25:01 GMT
Suppose it depends how many rads/BTUs it's feeding. Two or 3 smallish rads may be ok on 15mm, but for a normal house with usual amount of rads it's never going to heat them. Very rough guide is 15,000 BTU max output of rads on 15mm F&R. 11 rads on system 💩💩💩 |
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Post by endfeed on Dec 14, 2020 17:26:06 GMT
Two doubles💩💩💩
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Post by dickpuller on Dec 14, 2020 19:19:05 GMT
There’s many factors to consider in CH pipe sizing.
Flow rate, Circulation Pump Head, Delta T between F&R, radiator sizes compared to Room Heat Loss etc etc.
Now, I’m not for a minute suggesting these 15mm tubes are the right size, but it’s not just a simple ‘Rule of Thumb’ or back of a fag packet calculation.
I did a job once where I Teed off a 8mm pipes for a Bedroom Radiator for a small En-Suite ladder towel rail.
Also, back in the days of doing 6rads & a combi in a Day. It was fairly common to only take 22mm to the first radiator tee & remaining 5 where in 15mm. But that was on atmospheric combis with high temperature Flows. It worked OK, rarely needed any balancing.
As long as we were in the Pub early after earning £350/day each, we didn’t give a shit!!
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Post by woodbine66 on Dec 14, 2020 22:15:19 GMT
Suppose it depends how many rads/BTUs it's feeding. Two or 3 smallish rads may be ok on 15mm, but for a normal house with usual amount of rads it's never going to heat them. Very rough guide is 15,000 BTU max output of rads on 15mm F&R. 11 rads on system 💩💩💩
When I bought my current house it had the same problem - 15mm F&R all the way from the boiler. Only 4 large single rads and a small one in bathroom. Couple of rooms had no rads as they had gas fires. Even then, the rads didn't heat that well. Can't imagine what it was like with 11 rads.
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Post by crowsfoot on Dec 15, 2020 7:19:23 GMT
There’s many factors to consider in CH pipe sizing. Flow rate, Circulation Pump Head, Delta T between F&R, radiator sizes compared to Room Heat Loss etc etc. Now, I’m not for a minute suggesting these 15mm tubes are the right size, but it’s not just a simple ‘Rule of Thumb’ or back of a fag packet calculation. I did a job once where I Teed off a 8mm pipes for a Bedroom Radiator for a small En-Suite ladder towel rail. Also, back in the days of doing 6rads & a combi in a Day. It was fairly common to only take 22mm to the first radiator tee & remaining 5 where in 15mm. But that was on atmospheric combis with high temperature Flows. It worked OK, rarely needed any balancing. As long as we were in the Pub early after earning £350/day each, we didn’t give a shit!! "A standard heating pack Madam" the same one on every property and one of those heat exchangers that fit into the Immersion heater boss converting the cylinder to indirect. Cheap and cheerfull! Late seventies early eighties era, as long as the words "background heating" featured in the contract it was all legal. It was what the public wanted at the time and good money was earned installing them. |
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Post by woodbine66 on Dec 15, 2020 14:02:04 GMT
Late seventies early eighties era, as long as the words "background heating" featured in the contract it was all legal.
Yes, that's what my parents had - background heating. All very well if you always live in the background, but didn't really heat that well. But we have to remember that compared to what previous generations had (frost on inside of windows) it was sheer luxury.
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Post by endfeed on Dec 15, 2020 21:03:26 GMT
When I bought my current house it had the same problem - 15mm F&R all the way from the boiler. Only 4 large single rads and a small one in bathroom. Couple of rooms had no rads as they had gas fires. Even then, the rads didn't heat that well. Can't imagine what it was like with 11 rads.
This is the weird bit woody, the heating works very well,can't fault it. I'm planning on upgrading the pipe work to 22mm, but I'm torn/if it ain't broke don't fix it. |
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Post by battle1066 on Dec 15, 2020 21:36:50 GMT
When I bought my current house it had the same problem - 15mm F&R all the way from the boiler. Only 4 large single rads and a small one in bathroom. Couple of rooms had no rads as they had gas fires. Even then, the rads didn't heat that well. Can't imagine what it was like with 11 rads.
This is the weird bit woody, the heating works very well,can't fault it. I'm planning on upgrading the pipe work to 22mm, but I'm torn/if it ain't broke don't fix it. It will work out cheaper to do the modification now than after you've decorated. |
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Post by endfeed on Dec 15, 2020 22:47:09 GMT
Very true battle 👍 I don't want to be lifting that floor when it's down. It's bugging me why they installed the combi in 2018 all in 15mm, to me the 15mm pipe work isn't new it's existing as well as the redundant 22mm,can't help thinking the previous system was set up this way and would have been installed in the 80's can't think of a set up of 22 flow and return with separate 15mm flow and return.🤔🤔🤔
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Post by dickpuller on Dec 16, 2020 7:52:00 GMT
When I bought my current house it had the same problem - 15mm F&R all the way from the boiler. Only 4 large single rads and a small one in bathroom. Couple of rooms had no rads as they had gas fires. Even then, the rads didn't heat that well. Can't imagine what it was like with 11 rads.
This is the weird bit woody, the heating works very well,can't fault it. I'm planning on upgrading the pipe work to 22mm, but I'm torn/if it ain't broke don't fix it. I rest my case M’Lud!! |
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.from the left hand side of picture is hot and cold, next to it is redundant 22 mm old flow and return, then moving over to the 3rd void is flow and return from combi boiler in 15mm no 22 at all? I believe a open vented got taken out and replaced with combi boiler, but why the hell would they have ran it all in 15mm? 
