ᐅ Plumbing Rough-In Inspection: What Should We Pay Attention To?
Created on: 18 Aug 2022 10:19
F
fromthisplace
Hello everyone,
We are now having the shell inspection with the plumber. We already selected the fixtures back in March.
1. About the heating:
Our initial scope of work listed two models. The reason given was: "Depending on which one fits your house better." The contract now specifies the Stiebel Eltron LWZ 5S. So, I assume that a heating load calculation has been done and that this system fits our house, or am I mistaken?
2. About the inspection:
I understand that we will finalize the exact locations for the water connections and toilets. One point is the utility sink in the technical room. We would prefer a full-sized table here and need to discuss whether the plumber will install this or if we are allowed to buy it from the furniture store.
3. About the underfloor heating:
As the client, do we have any say in this? I would like to express that I prefer a low flow temperature and to ask if they can lay the loops quite close together. Of course, this is more like telling the contractor how I would like their work to be done.
Thank you all.
We are now having the shell inspection with the plumber. We already selected the fixtures back in March.
1. About the heating:
Our initial scope of work listed two models. The reason given was: "Depending on which one fits your house better." The contract now specifies the Stiebel Eltron LWZ 5S. So, I assume that a heating load calculation has been done and that this system fits our house, or am I mistaken?
2. About the inspection:
I understand that we will finalize the exact locations for the water connections and toilets. One point is the utility sink in the technical room. We would prefer a full-sized table here and need to discuss whether the plumber will install this or if we are allowed to buy it from the furniture store.
3. About the underfloor heating:
As the client, do we have any say in this? I would like to express that I prefer a low flow temperature and to ask if they can lay the loops quite close together. Of course, this is more like telling the contractor how I would like their work to be done.
Thank you all.
F
fromthisplace19 Sep 2022 19:03Thank you! Could you also take a look at the attached plans?
Are they acceptable from a planning perspective?
Do I understand correctly that, for example, in the living room there are three heating circuits of 84.43 m (277.2 ft) each, so a total of 253.29 m (831.7 ft) of piping will be installed?
Are they acceptable from a planning perspective?
Do I understand correctly that, for example, in the living room there are three heating circuits of 84.43 m (277.2 ft) each, so a total of 253.29 m (831.7 ft) of piping will be installed?
S
SaniererNRW12319 Sep 2022 19:26fromthisplace schrieb:
Are the plans okay from a design perspective? These are just calculations for now. There seems to be an error in the heating capacity in the bathroom. The pipe length does not correspond to 36 watts. You should ask about that.
fromthisplace schrieb:
Did I understand correctly that, for example, three heating circuits of 84.43m (277.1 ft) each are installed in the living room, totaling 253.29m (831.2 ft) of tubing? Exactly. You need about 9–10m (30–33 ft) of pipe per square meter (sq m) of living area. So for 25 sq m, roughly 230–250m (755–820 ft).
F
fromthisplace19 Sep 2022 19:37All right, thank you! 🙂
Could you briefly explain the error to me? Should the pipe length be longer to achieve 36 watts?
Is it possible to estimate, based on the rooms and conditions ("standard" single-family house, photovoltaic system with 10.3 kWp on the roof), how much the heating saves per year in view of current electricity prices if operated at 28°C (82°F) instead of 35°C (95°F)? How much does this extend the service life?
The thing is, we would basically like to do it. However, the 4,000 euros have not been budgeted for.
SaniererNRW123 schrieb:
These are just calculations at first. There seems to be an error in the heating output for the bathroom. The pipe length does not correspond to 36 watts. You might want to ask about this.
Could you briefly explain the error to me? Should the pipe length be longer to achieve 36 watts?
Is it possible to estimate, based on the rooms and conditions ("standard" single-family house, photovoltaic system with 10.3 kWp on the roof), how much the heating saves per year in view of current electricity prices if operated at 28°C (82°F) instead of 35°C (95°F)? How much does this extend the service life?
The thing is, we would basically like to do it. However, the 4,000 euros have not been budgeted for.
S
SaniererNRW12319 Sep 2022 19:54fromthisplace schrieb:
Could you briefly explain the mistake? Should the pipe length be longer for 36 watts?36 watts equals about 5 tealight candles 😉. That won’t generate much heat. For the pipe length, it should actually correspond to around 300 watts.Unfortunately, I don’t have a rule of thumb for energy savings. I’d estimate about 10–15% lower heating costs. You can do a rough calculation yourself to see if it’s worth it for you.
R
RotorMotor19 Sep 2022 21:41Sorry for the late reply.
As currently calculated, I wouldn’t proceed with the order.
In this state, it wouldn’t be effective because all circuits would have to be drastically reduced to achieve warmth in the bathroom.
I’m not so sure if this is a calculation error. It could simply be due to the low delta T of 4 degrees Celsius (39°F) and the relatively wide pipe spacing of 10cm (4 inches) for a bathroom.
First of all, what requests did you express?
Did you specify the desired room temperatures?
Do the throughput values correspond to the actual floor coverings?
Some of this does not quite match my expectations.
Will you be installing an (electric) supplementary heater in the bathroom?
As currently calculated, I wouldn’t proceed with the order.
In this state, it wouldn’t be effective because all circuits would have to be drastically reduced to achieve warmth in the bathroom.
I’m not so sure if this is a calculation error. It could simply be due to the low delta T of 4 degrees Celsius (39°F) and the relatively wide pipe spacing of 10cm (4 inches) for a bathroom.
First of all, what requests did you express?
Did you specify the desired room temperatures?
Do the throughput values correspond to the actual floor coverings?
Some of this does not quite match my expectations.
Will you be installing an (electric) supplementary heater in the bathroom?
KingJulien20 Sep 2022 08:56The good news is that you would have to be quite careless for this heating system to use a lot of electricity. 😉
As mentioned elsewhere, I ended up using about 2000 kWh per year, including hot water.
With this setup:
https://www.hausbau-forum.de/threads/spontane-verbesserungen-an-auslegung-fbh.37707/
I'm also not sure if laying the pipes closer together will really make much difference, since even in the coldest winter, my system never runs continuously.
On the other hand, if money isn’t a concern, I would always spend it on something that can’t be changed later.
Alternatively, you could ask the trade specialist to make adjustments on site. I managed to convince them to add some extra loops under the bathtub.
It didn’t help much though; the bathroom remains the coldest room on the upper floor. But that’s what electric heaters are for 😉
As mentioned elsewhere, I ended up using about 2000 kWh per year, including hot water.
With this setup:
https://www.hausbau-forum.de/threads/spontane-verbesserungen-an-auslegung-fbh.37707/
I'm also not sure if laying the pipes closer together will really make much difference, since even in the coldest winter, my system never runs continuously.
On the other hand, if money isn’t a concern, I would always spend it on something that can’t be changed later.
Alternatively, you could ask the trade specialist to make adjustments on site. I managed to convince them to add some extra loops under the bathtub.
It didn’t help much though; the bathroom remains the coldest room on the upper floor. But that’s what electric heaters are for 😉
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