can anyone identify my cenral heaitng system

[yonner]

the boiler is in the kitchen and the tank is being moved into the loft there is two pumps one for the heating obviously and an other wich seems to pump hot water around my taps

 

[Deleted member 2053]

It would doubtless help a little if you could post up some pictures!

 

[Deleted member 261]

tell us do...
copper cylender any writing on it?
two tanks in the loft?
what make & model boiler?

 

[Jay_1981]

sounds like a twin pumped system, one pump serves to pump water from boiler around rads the other serves to pump water from boiler up to the cylinder to heat the hot water, if it is this system design their will be a brass fitting under one of the pumps(the central heating pump) it will have an arrow on it pointing away from the pump, this is a non-return valve.
I have only ever seen one other configuration with two pumps (excluding underfloorheating) and this was in a very large property with poor water pressure and served to pump fresh domestic water to hot taps, improving water pressure.

My money will be on the first

 

[PLUMB111]

If the second pump is of brass construction it could be a Hot water pumped return, so that you always have hot water at the taps with no dead legs.
The pumps are yellow if it is a Grundfos.😕

Photos would be a bonus.

 

[Deleted member 2053]

Part of the reason that I suggested photos is that it is possible that the second pump is a shower booster........

 

[HTB]

Sonds like an SCS system, twin pumped split return, has one of the pumps got 2 outlets?

Easy to spot, most CH pumps have one in one out so only 2 in total, if one of your pumps has 3 connections its probably SCS. Came across it twice, both times ripped both pumps out and put in either s`plan or y' plan as required. If the pump with 3`ports on it fails can be expensive to replace, other pump standard CH pump. Big clue will be lack of any porting (no 3 way valve or lack 2 zone valves).

You can get the 3 port pump, personally wouldn't bother, I'd update it.

 

[Deleted member 261]

I think he means a DHW circulator

 

[HTB]

Actually I meant SMC Fully Pumped Systems

Have a look at this but bear in mind the pumps can be much further apart, not as close as they are in the picture on here, I been to a house where one was in the airing cupboard and another was in a differsnt room, big clue would be that the 3 port pump could actually have SMC stamped/embossed on it.

 

[REDSAW]

i agree, thats what i was going to sugest 'htb', smc controller one. but you beat me to it. 2 votes.

 

[oilman]

the domestic circulator pump will be iron and painted red or blue or black.
Is the other pump similar looking but yellow and made of brass?
If so it is a DHW (Domestic Hot Water) Circulator and it pumps the DHW in a ring so that any tap produces hot water fast with minimal wasted water.

 

[LIFES A GAS]

You could even have a thermal store type cylinder with the second pump for heating when demanded, with the limited information you have given it is imposible to answer your question but i agree with oilman it's most likely a bronze pump which are only usually fitted in comercial or large domestic DHW systems, those pumps normally run 24/7 and pump the water around the house and back to the cylinder..
Martin

 

[oilman]

one of my customers has a combi with 54mm DHW and the return line in 28mm

 

[migoplumber]

explain that one to me again oilman, how do you have a 'combi' with a flow and return. even if it was just a combi and somehow pipework upped to 54mm the pipework would contain about a litre every foot of pipe. if his bathroom was 10 metres away, that would mean pulling 30 odd litres of dead legged water before it even starts to get warm, and a current boiler rates would mean about a 3minute wait !!

 

[WHPES]

one of my customers has a combi with 54mm DHW and the return line in 28mm

I've got two like that (both large hotels) plus a large manifold arrangement for hot and ditto from the header tank to work all the pumped showers!

 

[migoplumber]

forgot to add, now all grundfoss pumps are stainless steel impellers, so you could find a red pump head on yellow body, far cheaper to replace just the head than the whole thing, and once you've got your brass body - keep it. you will find red headed pumps on dhws !

 

[Billy Bob Bob]

explain that one to me again oilman, how do you have a 'combi' with a flow and return. even if it was just a combi and somehow pipework upped to 54mm the pipework would contain about a litre every foot of pipe. if his bathroom was 10 metres away, that would mean pulling 30 odd litres of dead legged water before it even starts to get warm, and a current boiler rates would mean about a 3minute wait !!

dont know Shaun,confused the hell outa me to,poor combi

 

[migoplumber]

yep heat exchanger would need replacing every couple of months ! - cant wait for an answer ! and thats just the start of it. was going to do a list, but it dosnt have an end in my brain

 

[oilman]

oil boilers are different, They are cast iron and hold a lot of heat in their construction, this boiler contains a store of DHW which is fed into a blending valve at 60 degrees circulated and returned to the boiler by a brass Grundfos and re-heated, so because the water is circulated it is local to every tap so minimal water is wasted and the boiler maintains the heat of the circulated hot water. The cold water to the boiler is gravity fed.

 

[LIFES A GAS]

oil boilers are different, They are cast iron and hold a lot of heat in their construction, this boiler contains a store of DHW which is fed into a blending valve at 60 degrees circulated and returned to the boiler by a brass Grundfos and re-heated, so because the water is circulated it is local to every tap so minimal water is wasted and the boiler maintains the heat of the circulated hot water. The cold water to the boiler is gravity fed.

Sounds like a thermal store cylinder to me!
Martin

 

[migoplumber]

not a combi