Central Heating Pump Replacement

I put the CH pump in about ten or so years ago, but now it is worn out. Have bought a new Wilo pump to replace it, but am wondering about the direction of flow from or too the boiler.

Last time, I just replaced it in the same position as the previous one, but now I don't know whether that was right. So the question is - is flow either way acceptable, or critical to the CH operation?

Thanks.

Re: Central Heating Pump Replacement

On my system Dobra, the pump pulls the water round (as opposed to pushing) and it is at the cool end of the system where the water returns to the boiler. Little arrow on the pump indicating direction of flow. I would imagine you should keep the pump as cool as possible. Hope this helps Dobra.

Re: Central Heating Pump Replacement

As OG says, make sure the flow of the pump is the correct way round especially important if you have TRV valves fitted to your radiators.

It wouldn't hurt to flush the system out while the old pump is still fitted before fitting the new one.

Re: Central Heating Pump Replacement

Pump flow is from the boiler to the controls/diverter valves.

Do it the other way round if you are on an unpressured system it can cause a few problems.

If on a combi it will not work.

Re: Central Heating Pump Replacement

Think that would need an expert to do.

Re: Central Heating Pump Replacement

Not necessarily, drain some of the water down from the system and pour in some specialised cleaner at one of the radiators. Run the c/h for a few days then drain the lot completely before filling up with fresh water with some protective additive. Make sure that the additive is suitable for your boiler as some of the newer aluminium boilers can react to it.

Re: Central Heating Pump Replacement

I can do that but you are saying that to the topic starter asking which way he fits a pump.

Re: Central Heating Pump Replacement

I would advise changing the boiler to a more modern one which does not need an external pump at all !

Re: Central Heating Pump Replacement

Big Bucks Malcolm, and much upheaval, although if it's an old boiler wait until the summer and change it then rather than wait until it gives out - possibly in the winter...Brrrr I'm in a similar situation myself. Got a back boiler that's twenty years old, not been a spot of bother and I can service it myself.....But I think the time is nigh!