Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 12-01-2014, 07:17   #16
Nearly an old salt
 
goboatingnow's Avatar

Cruisers Forum Supporter

Join Date: Jun 2009
Posts: 13,649
Images: 3
Re: Great Water Heater ? Copper lined .

Quote:
Originally Posted by sailorchic34 View Post
No question, aluminum is a retched material for a water heater/calorifier.

Actually while the installations look the same, the standards used in the UK and USA are not at all the same. The UK Copper water heater has a much lower maximum working pressure, generally around 30-35 psig.

The UK pressure relief valve is sized to relief about 5 psig over maximum working pressure. US water heaters are designed for 80 psig working pressure as most all cities have 50-70 psig (or higher) city water pressure. US pressure relief valves are generally set at 100 psig

The copper water heaters require an expansion tank as the copper tank wall can not resist thermal expansion. This is the case even with a VSD water pump. On high pressure cold water (over 35 psig or so) a pressure reducing valve may need to be installed on the cold water inlet to the copper heater.

The copper heaters in the UK are used in homes and boats. In the US they should only be used in boats and don't meet US plumbing codes.

With all that said, the copper UK heaters are probably the best there is for boats.

Oh, on PEX, Just to clearify, PEX does resist freezing in that it does not break on the first few freeze /thaw cycles. It will however fail given enough freeze /thaw cycles. The PEX walls do get weaken in the freeze thaw cycle.
I was referring to boats plumbing not homes. Boats in the US and UK are all plumbed with similar equipment.

In the UK , virtually no calorifier would be used in a home , and vice versa.

Also few UK homes have closed and hence pressurised hot water , most are driven by a simple head of water from the cold water tank in the attic. You can do " high pressure" systems , but not that common in ordinary domestic houses. Hence most UK homes have no pressure relief valves on the hot water cylinders

As you you comments Re copper on boats and vsds. The existence of an accumulator is sufficient to cope with hot water expansion as there is no back flow preventer. ( in UK calorifiers )

Dave
__________________

__________________
Check out my new blog on smart boat technology, networking and gadgets for the connected sailor! - http://smartboats.tumblr.com
goboatingnow is offline   Reply With Quote
Old 12-01-2014, 10:28   #17
Moderator
 
sailorchic34's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: SF Bay Area
Boat: Islander 34
Posts: 4,812
Re: Great Water Heater ? Copper lined .

I was actually aware (learned that in the 80's) that the UK used atmospheric/unpressurized water heaters. Though I might expect a calorifier in apartment buildings, etc.

Agree that a "properly" sized accumulator/expansion tank would be acceptable if there were no PRV's, check valves or mixing valves in the system. If you look at the manufacturers installation instructions, you will fine that sometimes they indicate a separate expansion tank on the discharge of the water heater.

This is the case with the Solaris /SureJust units the OP was looking at BTW. Both come with a mixing valve on the hot water discharge, which requires a second expansion tank on the hot water side of the unit, per the manufacturers instructions.

I guess my short answer would be to simply read the installation instructions. The working pressure limitations of the UK units might catch a few US boaters by surprise. Knowing how much guys like reading directions and all. That really was all I was trying to say.
__________________

__________________
sailorchic34 is offline   Reply With Quote
Old 12-01-2014, 10:35   #18
Senior Cruiser
 
DoubleWhisky's Avatar

Cruisers Forum Supporter

Join Date: Oct 2010
Location: Home at Warsaw, Poland, boat in Eastern Med
Boat: Ocean Star 56.1 LR
Posts: 1,841
Re: Great Water Heater ? Copper lined .

Quote:
Originally Posted by sailorchic34 View Post
I guess my short answer would be to simply read the installation instructions. Knowing how much guys like reading directions and all. That really was all I was trying to say.
And You made a good point
__________________

__________________
DoubleWhisky is offline   Reply With Quote
Reply

Tags
water

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Watermakers Elisakp46 Plumbing Systems and Fixtures 43 12-12-2013 10:38
Achtung MdR Boaters! fstbttms Construction, Maintenance & Refit 1 06-12-2013 00:53
Cooling Effect of Water Heater SV Sea Monkey Engines and Propulsion Systems 14 18-10-2013 17:31
Cleaning the Fresh Water System off-the-grid Plumbing Systems and Fixtures 52 16-07-2012 05:30
Refilling Water Tanks ironhorserider2 Plumbing Systems and Fixtures 19 29-09-2011 07:01



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:28.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.