Adding hot water capacity to a wb37cdi

jassdhali · 23 Sep 2012

Gents,
Currently have a WB 37cdi, sometimes when hot water is on demand, hot water from other taps is lifeless. Don't really want to replace the boiler, was wondering whether I am able to add some sort of hot water cylinder storage to the existing system?
Thanks

picasso · 23 Sep 2012

Yes it's no problem to add a hot water cylinder to you boiler, there are different ways of doing it but an s plan is the usual way.

spudkey · 23 Sep 2012

When you say lifeless do you mean no flow or water is cold

jassdhali · 23 Sep 2012

Flow is really slow.
If I can add a cylinder can anyone make a suggestion on what type, also what's S plan. Sorry for daft question, if it is daft that is
Thanks

ServiceNumpty · 23 Sep 2012

Your cold water incoming flow is obviously poor, so it means cold water tanks in the loft.

dcawkwell · 23 Sep 2012

Add an unvented cylinder. Job done. Your existing boiler can
heat this up.
Ensure you have about 20-25 litres of cold mains flow to the house.

If you have a plumber come around to quote and wants to replace
the boiler to convert you to a tank system avoid them. They
are obviously a numpty.

picasso · 23 Sep 2012

If his mains can't run two taps at the same time it's unlikely it's going to run an unvented cylinder.

Terry lambert · 23 Sep 2012

What about re fitting a cold water tank and then pumping the cold down to the boiler?

Never done it but can't see why this wouldn't work

Terry lambert · 23 Sep 2012

I should add this would only give you the max that this boiler can supply which is 13.3 ltrs min at a 40 degree temp rise

picasso · 23 Sep 2012

Lots of options

break tank with pump and unvented cylinder

break tank and pump to combi

tank in loft with vented cylinder with maybe pumped shower

depends on budget and space but all can use existing combi.

Murf520970 · 23 Sep 2012

is there an cold inlet filter possibly partially blocked

whats the flow like from a cold tap

jassdhali · 25 Sep 2012

Gents,
Cold flow is great. We had supply pipe replaced for new plastic feed fitted from stop tap to inside house.
I think its just the case that our hot water demand sometimes outsritps the boilers potential.

gasanstuff · 25 Sep 2012

25mm plastic outside?. I try to upgrade internal 15mm pipe to 22mm at least to the t for the boiler.

Terry lambert · 25 Sep 2012

If your getting around 13 ltrs a min from your hot then using your combi to heat a tank or split the hot water load with a water heater?

oph · 25 Sep 2012

Anybody considered a soiled plate HX ................?

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Adding hot water capacity to a wb37cdi

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