Advice on heating in a new build property

[slacky]

Hey guys

looking for abit of advice on my heating system in a house I’ve just moved into. Last week I had to bleed a few radiators which I thought was normal but today I’ve had to go round bleeding them again and there was quite abit of air in them. How often should they need to be bleed? The down stairs toilet needed bleeding first time round but now it’s stone cold but doesnt need bleeding. What could be wrong with this? Also a few radiators are hot to touch but if I put my hand over the top it doesn’t feel like much heats coming off them and lastly for a new build property it’s costing anything from £4-6a day for gas and the heatings only on a few hours a day but doesn’t seem to reach temperature. For a new build property it seems abit excessive my old house was built In 1960ish and didn’t cost this much to run.

any help would be appreciated

thanks

 

[slacky]

hey guys

6 weeks later and im still in the same situation. Had the insulation people out to check all insulation which is ok. Ive worked out the maximum gas the boiler can run on my current gas rate is 71p per hour. Over the last week or so ive been writing down every hour how much gas has been used. It ranges from 40-70p every hour even when the house is upto temperature. Even though the stats turn off it doesnt take long before their kicking back in again. During the heating times the boiler doesnt really get a break.

Ive emailed ideal technical explaining the situation hoping they might shed some light on the possible causes. I think one of the causes could be the size of the rads in the hallway and both landings. Am i right in thinking when measuring the hallway you measure the stairs as if they wasnt there ? The hallway is 5m long and 1m wide with an external front door according to the stelrad website should need a btu of 2568. Then the stair space measures 1.8m by 1m with 1 external wall and again on the stelrad website it says it needs a btu of 925 which together equals 3493. The rad in there is a stelrad k1 600 x 500 which gives out 1575 btu. This is the same on the first and second landing

Ive measured the bedrooms and the size of the rads in there they seem right but only just they seem to have put bare minumum in there

Any help would be appreciated

 

[centralheatking]

hey guys

6 weeks later and im still in the same situation. Had the insulation people out to check all insulation which is ok. Ive worked out the maximum gas the boiler can run on my current gas rate is 71p per hour. Over the last week or so ive been writing down every hour how much gas has been used. It ranges from 40-70p every hour even when the house is upto temperature. Even though the stats turn off it doesnt take long before their kicking back in again. During the heating times the boiler doesnt really get a break.

Ive emailed ideal technical explaining the situation hoping they might shed some light on the possible causes. I think one of the causes could be the size of the rads in the hallway and both landings. Am i right in thinking when measuring the hallway you measure the stairs as if they wasnt there ? The hallway is 5m long and 1m wide with an external front door according to the stelrad website should need a btu of 2568. Then the stair space measures 1.8m by 1m with 1 external wall and again on the stelrad website it says it needs a btu of 925 which together equals 3493. The rad in there is a stelrad k1 600 x 500 which gives out 1575 btu. This is the same on the first and second landing

Ive measured the bedrooms and the size of the rads in there they seem right but only just they seem to have put bare minumum in there

Any help would be appreciated

Thanks for keeping us informed, this might be the right time for you to re summarise your position as not everbody will have time to read it all from the beginning . My take on your problem is this
1. New build 2. Bare minimum heating system which does not reach your quite reasonable expectations 3 Total kw rad output 8kw. 4 boiler rarely modulates just races on to keep up
Question ..what is the boiler and it’s output in Kw Centralheatking

 

[slacky]

Thanks for keeping us informed, this might be the right time for you to re summarise your position as not everbody will have time to read it all from the beginning . My take on your problem is this
1. New build 2. Bare minimum heating system which does not reach your quite reasonable expectations 3 Total kw rad output 8kw. 4 boiler rarely modulates just races on to keep up
Question ..what is the boiler and it’s output in Kw Centralheatking

Thanks for the reply

The boiler is an ideal logic heat 15kw

ive been asking the plumbing company for the spec of rads boiler etc thats been requested from the builders but they ignored me and also asked the builders which he said hes laptops playing up which is a coincidence but hes ment to be coming round next week to go through it with me. Where do i stand with them putting bare minimum in which clearly isnt working?

ive also noticed pipes knockng in places when there cooling down. Whats the cause of this?

 

[Scott_D]

have your neighbours got the same setup and issues?

 

[slacky]

i havent asked them directly but i checked their meter every day same time for a week to see what they was using (naughty i know) they was using roughly £1.80-2 on the rate im on. Although there house is a 2 storey one and mines slightly bigger i cant see me using twice as much as them. Theres still 5 people living there all seem to be home at different times during the day and when i get home from work between 4-5 theres steam coming from their flu so heating must be on

 

[EvilDrPorkChop]

Insulation might be OK but have you not considered draughts? Draughts will cause your house to cool down much quicker than no insulation.... Poorly fitted doors/windows, seals not fitting correctly, loft hatches not sealing, extractor fan back draughts not working etc.

 

[centralheatking]

Thanks for the reply

The boiler is an ideal logic heat 15kw

ive been asking the plumbing company for the spec of rads boiler etc thats been requested from the builders but they ignored me and also asked the builders which he said hes laptops playing up which is a coincidence but hes ment to be coming round next week to go through it with me. Where do i stand with them putting bare minimum in which clearly isnt working?

ive also noticed pipes knockng in places when there cooling down. Whats the cause of this?

15kw is a joke for your property 2x that in my opinion Chking

 

[slacky]

the house was air tested for draughts etc not sure if this means anything? when the heatings off the house takes a while to cool down say its 22 degrees when the heating turns off itll only go down a degree or so over the next 1-2 hours. from experience from previous houses when the stats reach temperature they keep raising to a degree or so higher as the rads keep giving abit of heat out but this doesnt seem to happen in this house itll get to 21-21.5 degrees then turn off thinking itll keep rising but it doesnt casuing it to come back on a few minutes later

how would you determine what size boiler is required?

 

[Scott_D]

Do you have an unvented cylinder?
Do you time the hot water in times?
Do you use lots of hot water?

 

[EvilDrPorkChop]

the house was air tested for draughts etc not sure if this means anything? when the heatings off the house takes a while to cool down say its 22 degrees when the heating turns off itll only go down a degree or so over the next 1-2 hours. from experience from previous houses when the stats reach temperature they keep raising to a degree or so higher as the rads keep giving abit of heat out but this doesnt seem to happen in this house itll get to 21-21.5 degrees then turn off thinking itll keep rising but it doesnt casuing it to come back on a few minutes later

how would you determine what size boiler is required?

Your stats will come on and off as they’ll be TPI stats. They’ll work out how quickly a room cools down then come back on before the temperature decreases to maintain the room at that temp.
As Scottd says have you got the HW on at the same time? Ensure that is timed to come on outside the heating is on.

 

[slacky]

Do you have an unvented cylinder?
Do you time the hot water in times?
Do you use lots of hot water?

not sure if its unveneted or not. no the hot waters on constant as this was the advice from the plumber who came to fix a leak. he said its best to have it that way then you only heat up what you use rather than the whole tank. I wouldnt say we use loads of hot water. I have a shower every night. Misses has a bath probably 3 nights a week then shower the other nights and kids a bath every other night

 

[Scott_D]

Try timing the hot water for a week.
check the stat is at 60.
Check you don’t have water Dripping at the tundish.

 

[slacky]

Try timing the hot water for a week.
check the stat is at 60.
Check you don’t have water Dripping at the tundish.

just checked the stat and its slightly higher than the pre set point i think some one told me to change this in the past. What times would you recommend having the hot water on so it doesnt interfere with the heating? we generally use 90% of hot water between 6-9. The heatings set to come on 5:30-7:30 in the morning and 4:30-9 at night.

i checked the tundish and its seems dry

 

[Scott_D]

Is the boiler temp higher than the cylinder stat temp?

 

[slacky]

The boilers set at 80
[automerge]1581849044[/automerge]
Can any one recommend a btu calculator they trust and is accurate? I’ve been on the Stelrad and Plumbnation calculators but both give very different results

 

[centralheatking]

The boilers set at 80
[automerge]1581849044[/automerge]
Can any one recommend a btu calculator they trust and is accurate? I’ve been on the Stelrad and Plumbnation calculators but both give very different results

BES list the Mears Calculator which we always used. Centralheatking

 

[slacky]

Just had a look at the mears calculator it looks quite complicated. I’ve wrote down all the measurements of the rooms from the floor plan of the house along with all the rads and btu outputs per room I just need a reliable calculator to work out what btu is needed

 

[centralheatking]

Just had a look at the mears calculator it looks quite complicated. I’ve wrote down all the measurements of the rooms from the floor plan of the house along with all the rads and btu outputs per room I just need a reliable calculator to work out what btu is needed

You will need to include outside walls, ceiling heights, windows and type as well. That’s why a mears calculator is the bees knees. Centralheatking

 

[slacky]

I’ve put all that in on both Stelrad and plumbnation calculators but get very different results

 

[Scott_D]

I’ve put all that in on both Stelrad and plumbnation calculators but get very different results

Do your radiator outputs get close to the lower figure?