Situation: Had a boiler system conversion. From Potterton boiler with Gledhill storage tank with on demand hot water to Veissman Combo with on demand hot water. 2 bed semi with only myself and wife living here. Unfortunately used iheat service which has no real customer service. Have had the same plumber (good guy) back for service and asked him about this and he tried his hardest to work it out, but he suggested fairly expensive works that I wasn't sure would deal with this particular problem.
Heating works very well. Hot water good to a point, mostly just having to learn the limitations of a 29kw combi. Irritated by the long delay before hot water at taps, seems very wasteful of water. Mains flow measures at around 12lpm. Boiler copes with about 8lpm flow at taps to produce max temp rise. Not a big issue.
Problem: We use a hand held shower head fed through the bath mixer taps to wash our hair. So we get a comfortable temp through the taps by adjusting hot and cold flows with shower head at height of tap level, but then when we raise the shower head to above head level (about 18 inches) the temp increases to too hot.
I'm trying to understand the physics but finding it a little difficult. As I understand it there is a pressure drop at the shower head rose and the supply pressure of both hot and cold are the same. However there will also be pressure drops at each of the supply valves which will be dependent on their adjustment. So why does changing the height of the shower head change the differential flows of the hot and cold water? I suppose the pressure of each supply would have to be the same in order for the extra head of water to equally affect the two supplies. Oops, I think I've just understood it. But please let me know if I'm right.
Solutions:
1. I wonder if a thermostatic mixer tap would improve the situation but am not convinced because I'm not getting the physics.
2. Would putting flow restrictors or pressure limiters on each supply be an idea?
Heating works very well. Hot water good to a point, mostly just having to learn the limitations of a 29kw combi. Irritated by the long delay before hot water at taps, seems very wasteful of water. Mains flow measures at around 12lpm. Boiler copes with about 8lpm flow at taps to produce max temp rise. Not a big issue.
Problem: We use a hand held shower head fed through the bath mixer taps to wash our hair. So we get a comfortable temp through the taps by adjusting hot and cold flows with shower head at height of tap level, but then when we raise the shower head to above head level (about 18 inches) the temp increases to too hot.
I'm trying to understand the physics but finding it a little difficult. As I understand it there is a pressure drop at the shower head rose and the supply pressure of both hot and cold are the same. However there will also be pressure drops at each of the supply valves which will be dependent on their adjustment. So why does changing the height of the shower head change the differential flows of the hot and cold water? I suppose the pressure of each supply would have to be the same in order for the extra head of water to equally affect the two supplies. Oops, I think I've just understood it. But please let me know if I'm right.
Solutions:
1. I wonder if a thermostatic mixer tap would improve the situation but am not convinced because I'm not getting the physics.
2. Would putting flow restrictors or pressure limiters on each supply be an idea?
