(817) 754-0465

It is currently Wed Mar 20, 2019 6:34 pm

All times are UTC - 6 hours

Post new topic Reply to topic  [ 3 posts ] 
Author Message
 Post subject: Tankless Water Heaters
PostPosted: Tue Oct 28, 2014 9:47 am 

Joined: Tue Jun 01, 2004 11:43 pm
Posts: 1028
Location: Canyon Country, Ca
Has anyone had to deal with having to heat your water in the greenhouse and gone with a tankless water heater?

I lost a number of plants this last year because our water got too cold during the winter. Not going through that again this year. I had debated adding a holding tank under the benches in the greenhouse that could regulate the water to the greenhouse temp and then I would be able to also produce some RO water to improve the quality of my water. But that is going to be expensive and a large amount of hassle.

A tankless water heater would solve the short term problem, would be cheaper and easier to implement overall.


 Post subject: Re: Tankless Water Heaters
PostPosted: Tue Oct 28, 2014 10:41 am 
Site Admin
User avatar

Joined: Fri Oct 24, 2003 1:57 pm
Posts: 16621
Images: 76
Location: Texas, USA
Hi Rob,
I have a tank less water heater for my greenhouse. It uses natural gas so I get endless supply of hot water. The heater itself is located in my storage shed - 10 feet away from my greenhouse. I had a valve installed so that it automatically mix cold and hot water together. I don't need very hot water to water my plants, thus I thought warm water is good enough.

The problem I encounter is that cold water has to flow at a large volume for the tankless water heater to kick in. If I just water a small amount of water, then water heater will not turn on. Because I grow most of my plants in moss - I don't want the full blast of water to get them very wet in the winter. I prefer to dispense a small amount of water enough just to wet the top layer of moss.

So I have a holding tank of 40 gallon that holds RO water. I use a circulating pump and 400 watt aquarium heater to keep the water at 70F. Then I use delivery pump to water my plants. The trouble is I need a 80 feet water hose. It is clumsy to drag a long hose from one end of the greenhouse (water holding tank is located) to another. I tried quick connect before - as there is a 25 feet water hose under each bench. But quick connect is not so easy to mess with day to day - so I'm now back to using 80 feet water hose.

40 gallon holding tank isn't much. But if I run out of RO water, I can fill it up with tap water from tankless water heater. I hope this makes sense.


Peter Lin, Admin
Big Leaf Orchids

 Profile Personal album  
 Post subject: Re: Tankless Water Heaters
PostPosted: Wed Oct 29, 2014 4:46 am 
User avatar

Joined: Fri Sep 17, 2010 7:52 am
Posts: 329
Location: Oak Island, NC
I had considered one at one time, but they are fairly pricey, and as Peter said, they are designed to provide hot water, not warm.

I went with a simpler route and bought a large wattage aquarium heater and put it in the RO tank. I set it at 75°, and everyone in the greenhouse is much happier.

Ray Barkalow, Orchid Iconoclast
Using science & logic to improve orchid growing

Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC - 6 hours

Who is online

Users browsing this forum: No registered users and 1 guest

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group