Circulating Pump

[iddon]

Central heating is warm upstairs and cold downstairs. Have bled all rads and have taken a look at trying to get the impellor moving again in the circulator pump but with no luck, so it looks like like my pump has finally given out after 24 years of service!

The pump in question is Grundfis UPS 15-50x18 MKII. I've priced 2 replacement pumps with the plumbers merchant, Grundfos replacement at £51 + VAT and a Wilo at £31 + VAT. 3 questions - is there any major perfomance issues between these 2 pumps, is it a DIY job?(pump can be isolated) and finally how long/cost should I expect to pay for labour ?

Thanks in anticipation

 

[twgas]

go for grundfos

 

[Soggy_weetabix]

A pump is only as good as the system it is installed in.

Labour.... how long is a piece of string.

1. Can the unions securing the pump to the valve be undone without sawing through them or tapping them undone once a groove has been cut in them?

2. Will the valves actually work?

3. Will valves work, but leak afterwards? (Can you re-pack glands if so)

4. Can you drain the system down and refill if valves dont work (replace valves aswell as pump?)

5. Will system actually refill when you want to fill it up? (eg Blockage in cold feed pipe to system.)

If you can get round any of the above possible problems then go for it.

Dave

 

[bengasman]

Grudfoss is easy winner.
Replacing the pump in itself should be half hour max. the big question mark is draining and refilling the system if the valves don’t work. with a nasty airlock that could be as bad as half a day.
Don’t forget the inhibitor

 

[ollski]

Replacing the pump in itself should be half hour max.

lol I shall remember that the next time I'm contorting myself round the back of a cylinder cutting the valves off with a junior hacksaw

 

[bengasman]

Replacing the pump in itself should be half hour max.

lol I shall remember that the next time I'm contorting myself round the back of a cylinder cutting the valves off with a junior hacksaw

notice my use of the word should

 

[Soggy_weetabix]

Replacing the pump in itself should be half hour max.

lol I shall remember that the next time I'm contorting myself round the back of a cylinder cutting the valves off with a junior hacksaw

Ollski... are we daring to agree on something?

Dave.

 

[iddon]

Thanks for the guidance, will probably go for the Grundfos based on advice. Inhibitor? Explain please

 

[iddon]

Inhibitor, sussed. Pump location is very accessible and have got a plumber coming tomorrow to fit. Thx again