Basic two pipe system for my 3 rad narrowboat heating install

[mitchellmoxo]

Hello,


I have a diesel water heater to install into a narrowboat i am currently fitting out.

Which heating layout would be better?

I have been advised on a two pipe reverse return plumbing layout rather than a direct return?

Here are some basic diagrams I drew up

I have also put a manual tap after the T piece to be able to just have the hot water tank - is this ok, there is no 240v for a electric valve?

Also what pipe sizes would be recommended?


2 Pipe Direct Return






Appreciate any advice in advance

Mitch

 

[Ermintrude]

Use a 12v normally closed relay then! And yes reverse return good. Hope you've got a water cooled genny and engine your using to heat your heating!

 

[mitchellmoxo]

Use a 12v normally closed relay then! And yes reverse return good. Hope you've got a water cooled genny and engine your using to heat your heating!

Hi mate what pipe sizes would you use?

 

[stevetheplumber]

what s the out put of the heater if its just a small webasto or eberspacher i would think it can all be done in 15mm

 

[Ermintrude]

15mm or 22mm if u want high flow rates low resistance

 

[mitchellmoxo]

Its a 5kw eberspacher - is there any down sides of using 15mm over 22mm? If not may aswell use the 15??

p.s thanks for the replys.

mitch

 

[Ermintrude]

22 better delivery lowerd pump head but u probably be ok with 15 or even 10

 

[rpm]

Sisters running 22mm off coal fire & back burner on her boat and know of an diesel eberspacher with 15mm on a 70ft boat.

 

[rpm]

Got a feeling Canalboat.co.uk covered this earlier this year, might be worth a look.