Gravity fed to fully pumped

N

newcomers

Joined
3 Aug 2006
Messages
282
Reaction score
0
Location
Hertfordshire
Country
United Kingdom
Went and looked at a job today. The fella is redoing his kitchen and currently has a floor standing boiler in the kitchen, which is gravity fed hot water. He would like this removed and a wall hung boiler put in. He also has a pump on the shower in the bathroom, which has all now been boxed and tiled in

My questions are these:

The flow and return to the cylinder is 28mm.....could I reduce these onto 22mm and put a gat valve on the return of the cylinder?

Would the current cylinder be ok to use (approx 20 years old), I would I be better off recommending a new cylinder?

Because of the pump to the shower, does this mean he cant have a combi because of the mains pressure going to the pump?

In this type of situation (gravity hot water), is the cheapest and easiest option (which is what he wants) to put an open vent boiler in, along with re-positioning the pump, and adding a 3 port, r/stat and cylinder stat?

Thanks
 
Sponsored Links
if u keep the cylinder you can keep the shower pump.
if u fit a combi then u cannot used a shower pump(like u say cos u cannot pump mains pressure.
if u r pumping the supply to the cylinder u can reduce the pipe to the cylinder to 22mm (but why bother)
when converting to fully pumped you may need to relocate the cf & ov pipes to before the 3 port.
I suppose you can keep the gravity cylinder but the heat transfer rate will be much slower than a new BS cylinder, also the insulation will be inferior to a BS one.
 
Sponsored Links
newcomers said:
My questions are these...
Click to expand...
This is a bit odd - you're undertaking a major installation, but you're asking some very basic heating system questions. :confused:
 
soft leave the poor wee lad alone :)

if you are hanging a new boiler it is probably part l compliant ergo the cylinder MUST also be part l compliant so it must be changed

as soggy says why not a c plan?

hello lor long time no see have a nice christmas mate?
 
So are you saying to basically keep the system as it is (gravity hot water, pumped central heating) and just stick at cylinder stat in and a 2 port on the hot water side?

Wouldnt it just be just as easy to stick a 3 port and have pumped hot water too? The pump will have to be moved from its existing location anyway
 
The positions of the cold feed and open vent on a gravity system are different to that for a fully pumped system.

However if the existing pump is on the return, the cold feed is on the bottom of the cylinder primary and the open vent on the top, I have found that it works to put a second pump on the dhw return and two relays. It's beyond the realms of someone who has to ask the question to organise though.

You could combine the two returns put the pump after they combine and use two zone valves on the individual return's prior to the pump, wire it up for S plan. It should work.
 
How about if I went fully pumped with a 3 port and pressurised system, that would be quite straight forward wouldnt it?
 
hasnt the 2 port on the hot return have to be a permanantly open one and only closes with power.
 
D

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
You must log in or register to reply here.
Sponsored Links

Similar threads

M
convert gravety fed to fully pumped
Replies
2
Views
1K
Nige F
N
J
Gravity Hotwater
Replies
2
Views
420
J Bean
J
H
gravity to y plan
2
Replies
18
Views
2K
halfax
H
B
Converting gravity fed to fully pumped
Replies
5
Views
14K
baggielad
B
M
Am I fully pumped
Replies
1
Views
889
Elkato531
Elkato531
Back
Top