From the United States of America? - Checkout our specific plumbing forum for you:USA Plumbing Forum

Discuss Powerflush Required following new Boiler Install and Chemical Flush in the Central Heating Forum area at

Good evening,

Please can I ask for some brief advice.

Last month I had installed a new boiler (Ideal 18kw) by a national firm. It's a townhouse with 4 floors, 10 heaters, a hot water cylinder and also a tank in the attic. The heaters look in good condition and have been retained from the previous system, its about 20 years old, each heater has a thermostatic valve (Siemens). The installation included a chemical flush. Most of the heaters were not coming up to temperature before the new boiler install and heating had to be left on for hours. Following the work, the system is working very well, with 9 heaters coming up to temperature quickly. However, there is one non-working heater, in the downstairs living room. Unlike the other heaters it wasn't working at all prior to the boiler installation and despite the chemical flush it is still not working at all. I did inform of this non-working heater when getting a quote and reference was made to the chemical flush.

The same firm that installed the boiler first asked me to bleed the faulty heater, but this did not work. They then sent on an engineer for the purpose of diagosis only (he appeared to be working on a contract basis). He identified that some sludge must be in this heater. The next step would be to book an engineer for the job, who would take the heater off the wall, move it to the garden and flush it out with a hose. However, when I called to book an engineer today, the story was different. The aftercare telephone operater spoke to a technician and manager and I was informed that I had been given the wrong solution, that a powerflush is in fact required, and this will be at the cost of £675.00. As the fault was pre-existing to the boiler installation, the cost will fall to me.

I am therefore left with two solutions. The first suggested by the engineer who thinks a heater can be taken out into the garden and flushed out - at no cost to me. The sales/aftercare line who think that a full system powerflush is requried. They justify this as they say that there will be sludge in the whole system (perhaps but every other heater is 100% performing and this leads me to believe that he chemical flush which was all that was deemed necessary in the first place has been successful throughout the system).

Assuming I've provided enough information, please can I ask if it seems that a full powerflush at £675.00 is the 'go to' solution for the problem I've described, or can a single heater be flushed out or even replaced at presumably less cost.

With thanks

Reply to Powerflush Required following new Boiler Install and Chemical Flush in the Central Heating Forum area at Plumbing questions, answers, tips and tricks.

Plumbing and Plumbers

Plumbing Workwear

Shower Power Booster

Water Underfloor Heating

CORGI Direct for Plumbers

The Wetroom Store

Plumbase Spares

New Posts Threads Members