Yes! You can run a propane furnace unvented. There was an article in the Greenhouse Grower a couple of months ago which stated that quite a few growers run unvented furnaces. We just finished up a Cravo Retractable Roof house and the furnaces are unvented in there; they are High Efficiency, which does cut down dangerous gases however. I personally don't know of any houses which are tight enough to prevent enough air exchange to allow waste gases to build up, UNLESS you are talking about a 10,000,000 BTU boiler in front of a little greenhouse or something to that nature. I think you will be fine. Marty Reichenberger Green Thumb Greenhouse Independence, KS Request for advice, My Lily (Lilium longiflorium) crop is just reaching Visible Bud. Height is on the tall side so I am trying to control with a negative DIF. The greenhouse is primarily heated by a hot water system with a gas forced air heater for backup. Unfortunately, the boiler is down for about 10-14 days awaiting a new heat exchanger :-( The unit heater is not keeping up. I would like 68-70F Nights, but can only maintain about 62-64F and the soil temp is 54. So the question is: If I put an unvented propane space heater in the house will I run a greater risk of damaging the crop with gas than trying to catch up on timing later? Or shall I run up the day temps and have the tallest crop in the west? Thanks for any and all opinions, Michael Layman layman@utahlinx.com
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- To: FLORINET@agvax2.ag.ohio-state.edu
- Subject: My Lily crop needs HEAT
- From: Michael Layman <layman@utahlinx.com>
- Date: Wed, 25 Feb 1998 03:35:22 -0800
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- Reply-To: Michael Layman <layman@utahlinx.com>
- Sender: owner-florinet@agvax2.ag.ohio-state.edu
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Request for advice, My Lily (Lilium longiflorium) crop is just reaching Visible Bud. Height is on the tall side so I am trying to control with a negative DIF. The greenhouse is primarily heated by a hot water system with a gas forced air heater for backup. Unfortunately, the boiler is down for about 10-14 days awaiting a new heat exchanger :-( The unit heater is not keeping up. I would like 68-70F Nights, but can only maintain about 62-64F and the soil temp is 54. So the question is: If I put an unvented propane space heater in the house will I run a greater risk of damaging the crop with gas than trying to catch up on timing later? Or shall I run up the day temps and have the tallest crop in the west? Thanks for any and all opinions, Michael Layman layman@utahlinx.com
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