Heating

[bexs]

We had an issue with our heating vessel which was red (Sealed system) which was corroded so was leaking water.  It was replaced with a grey one. 
Since then we have had further issues with the heating system with pressure going down and I have had two independent plumbers/heating engineers out. Both have said that the heating vessel should be red and not grey.  Surely a colour doesn't matter does it?
I have gone back to the developers whose heating company have said that the red ones are now being discontinued and that the grey ones are now being used.  There is conflicting information here and does this mean that the developers are just trying to get out of their responsibility.
I have no clue with this.  HELP

[New Home Expert]

Firstly name the housebuilder!
How are others going to learn (be warned) which builders are worse without such feedback on this forum?

There are two main types of Expansion Vessel dependent the application.
You will normally find a Red Vessel (Heating Vessels) to be used on a Sealed System Heating.
Blue Vessel or White Vessel (Potable Vessels) are most commonly used in a potable application such as an Unvented Water Heater or a Pumped System.

I have no idea why a grey one has been used.
The "red ones discontinued" comment is a fob off garbage in my opinion.
The make or size might be discontinued but the colour?

Your pressure keeps dropping because you have a leak on your heating system somewhere.

[raini]

I’m looking into this as well, and from what I’ve gathered, the color of the expansion vessel (red or grey) doesn’t necessarily affect its function, but the type might. It could be that the developers are correct about the switch to grey vessels, though it’s worth verifying with another professional.

[jacobsdhempsy]

I'm actually looking into this myself, and from what I’ve gathered, the color doesn’t really affect the functionality—what matters is whether the expansion vessel is suitable for a sealed system. It sounds like there’s a lot of mixed info, but if two engineers are pointing out a potential issue, it might be worth getting a third opinion.

[raini]

The color of the heating vessel generally doesn't affect functionality, though it may indicate usage type. If you're experiencing pressure loss, this could point to a deeper issue.

[jacobsdhempsy]

The colour difference in heating vessels likely relates to material use rather than function. A red one may signify a specific type or standard, but if grey ones are now commonly used, it might be a material update. For reliable gas mixing, I-Maximum offers automatic sng gas blender, which combine LPG and air precisely, providing a safe alternative to natural gas for industrial systems. Their mixers feature high-precision control and are designed to handle diverse pressures and temperatures, making them dependable for synthetic gas needs.

[New Home Expert]

Useful reply thank you