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It could only happen to us Boiler has shut down E110 I think
royhall:
If only Baxi had fitted a decent condensate pump this problem wouldn't exist. I fitted an external Grundfos pump under the timber floor next to the chimney on one about 15 years ago and never touched it since. Lost count how many of those Baxi pumps I have thrown away over the years. I haven't touched one of those horrible boilers in a long time, when I was fixing Baxi's I was always unfortunately unavailable.
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McCabe-Thiele (Ted):
--- Quote from: K2-K6 on January 14, 2025, 09:34:57 PM ---Couldn't the boiler be installed in raised position ..... leaving space under to facilitate a auxiliary pump installation ?
That's rather than a sump or underfloor void.
--- End quote ---
The boiler is fitted into a fireplace made of bricks with an original circular acid resistant pipe flu. The house was built in 1968 having sold floors and solid ground floor internal walls, upstairs there is only a part internal wall in the bathroom that is not solid bricks or blocks. The outer upstairs walls are formed by the roof design as its a giant Dorma style bungalow that looks like a house. When new there was a gas point fitted to a Red Quarry fire place hearth,no Copex type chimney liners or gas flu blocks back then. The original Baxi Bermuda boiler gas fire combination was actually partially bricked into the recess to reduce the opening to give the right amount of natural draft for the chimney.
When a BBU HE boiler is installed the special heat reistant double walled concentric plastic pipe flu was inserted inside the original lined chimney flu from the top of the roof down. This double skinned arrangement allows air for the boiler to be drawn from top of the chimney via the inner pipe to the burner, the exhaust gases are expelled throught the outer layer I think. This allows the boiler to be fitted to an inside wall of the house, as it's a condensing boiler that left the issue of what to do with the condensate. Baxis solution was to fit a small tank into the base of the boiler, level switches and a pump periodically pump this water out. In my case the condensate pipe goes throught the rear wall into the kitchen where it is connected to the waste water pipe system. This is quite a short distance, about 2 ft in total. The washing machine sits directly behind the exit point on the other side of the wall from the boiler.
To raise the boiler is theoritically possible as the front electric fire is fitted to the front hearth , it would not be an easy job as the chimney liner would need to be shortened, the three water pipes to the boiler as well. I think this would have been a good idea when the boiler was fitted but the retro cost would be expensive if I could get anyone to carry out the work.
royhall:
Your lucky. Some of the fires are attached to the boiler. The flue gases usually go up the centre tube with air drawn in around it via the outer pipe. It's safer that way , if the flue pipe leaks it goes into the incoming air instead of possibly into the room. It can also be detected by flue gas analysis. Some have two separate pipes. They were a horrible thing to fit
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K2-K6:
I fully understand the difficulty and why it's not possible post installation etc.
However, I like the thought process that examine things in considering solutions, whether possible of not.
From working installations (factory chemical handling) and having multiple pumps & machine arrangement, it always served to be convenient if a pump had decent access to contain lifing and environment durability needs.
Pumping from a sump, the one (inside Ted's boiler) installed in this case, we operated external pumps mounted above emergency sumps in our installation, simply with the draw side of pump piped to lowest point of that sump. It being fitted with a drop ball one way valve, then with the pump head having it's exit above it, this to effectively always keep the pump head "immersed" such that it would pull on demand to evacuate the remote sump reliably and when called by level switch.
Another, chemical automated mix machine used thus type https://www.clarksol.com/oscillating-piston-pumps/ to draw from open ended pipe in barrels of chemical concentrate, then to provide a mixed solution based on programming.
I viewed these as "lock gate type" in which they have little Reed type rubber one way valve in flow line and located at the pump head. Self bleeding, vacuum up from barrels sitting elbow them, ultra reliable. These little pumps used to run more or less 24hr hours at busy production period. Really easy to swap out if need to.
K2-K6:
Thinking further about it, the oil pumps on our bikes also sit above the fluid level generally, and rely on pump head staying full to immediately pump on demand too.
The pickup going down into the liquid, with pump head effectively remote and above natural liquid level.
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