Search my site


Copyright 2017 Michael Bryant

Protected by Copyscape Online Plagiarism Test




Boiler types
New boiler?

New boiler cost?

Condensing boilers
Combi boilers
Boilers in which I specialise
Older boilers - worth fixing?
Boiler servicing
Expected life of a boiler
The boiler temp control

What is "SEDBUK"?

Boiler descaling
The Powerflushing MYTH

Asbestos risk in boilers

Concealed flue duct risk
Boiler Reviews


Central heating:

How does it work?
Pipework layouts
Open-vented or sealed?
Thermostatic valves
Warm air heating

Unusual boilers:
PulsaCoil, BoilerMate
  & other thermal stores
Electric 'flow boilers'

Range & Potterton PowerMax

Ideal iStor
GEC Nightstor


Hot water:
Four types of HW system




Avoiding the rogues
Plumbers not turning up
Building Regulations
Common faults
Dangerous appliances
Mains hot water
DIY gas work
The Gas Regulations
Plumber or Heating Engineer?
Boilers in lofts




Useful links
My other websites



Why use me?

Here's Why!



Your feedback please...

Read visitors' comments
Add your own


Find recommended
 local tradesmen in
The Directory of Excellence 















Glow Worm HXi

12HXi, 15HXi, 18HXi, 24HXi, 30HXi

Quite a neat little boiler on the face of it, cheap and popular. But I don't like them (you guessed that from my first sentence didn't you? ;-) )

Uses the same heat exchanger as the most excellent Vaillant EcoMAX, but there the similarity ends. The HXi seems terribly prone to nuisance overheat thermostat tripping. And pre-mix fan failure. And control board failure. Everything else on it is great. Almost.

I'll expand. The programming, or rather the fault reporting, on the HXi is the big reason I don't like this boiler. The error codes are flaky to say the least. This boiler will report error codes that aren't in the Manufacturer's Instructions, or will report that the boiler is working correctly when it is plain stone cold and refusing to start. Fan failure for example. I had this a while ago and Glow Worm tech support said it will be either the fan or the control board. A new control board (170) made no difference, so I bought a new fan as well (190).... That fixed it but I couldn't bill the client for both as his old control board was fine when I re-fitted it, grrrrrr..... 

Not funny really, as it also wasted a LOAD of my time that I felt unable to bill the customer for either.


I HATE this boiler actually... (Ok, a bit strong, but I really don't LIKE it.)


Here are some more of it's problems:

1) Original burner door gasket needs replacement if disturbed for safety reasons. Has to be disturbed to service the boiler.

2) Condensate trap tends to leak inside the boiler causing corrosion of the case. A safety hazard.

3) Condensate trap cleaning cap underneath the boiler tends to fail to seal as thread doesn't fit properly. Has to be bodged with silicone, or better, a new trap and cap ordered, and fitted on a return visit. Infuriating.


Pleas don't call and ask me to service yours.


But maybe I'm being unfair. Email and tell me if you are pleased with yours ;-)




This page first published 28.02.09. 
(No emails received so far, and today is 18th April 2013!)




Protected by Copyscape Web Plagiarism Scanner



Contact me...
Click here


Home - Gas Safe Register - The Chartered Institute of Plumbing and heating engineering