Feedback on NTI GF200 Furnace

Steve_210

Hello All - Please see attached. Has anyone ever used one of there? I've never used on before. Just looking for some feedback.

norton928

Hi Steve, did you find out any more info on the NTI GF200? I'm looking at installing one in my house in Denver, but I'm a little wary given how new it is and I can't find any reviews or recommendations online. Did you end up installing one?

Steve_210

No that job did not happen as of yet
I really don’t know maybe somebody else could help

STEVEusaPA

I think one of the OW's (Original Wallies) reps it. Maybe he'll pop on and respond.

Henry

It is a Navien boiler. The instant hot water production does not work in cold climates as in many areas municipal water can be only 33F.So one needs 80F rise at least which equates to 4.8 GPM

njtommy

Their was a guy on instagram up in Canada that installed a couple. Ended up pulling them out do to some problems. Not sure what he incountered but he was happy with it. I think it’s a great idea but who knows if it will take off.

Steve_Wheels

Just to jump in, it is NOT a Navian BOILER, it is however a Navian 200MBH tankless WATER HEATER inside a NTI Furnace enclosure making this the worlds first 97% AFUE rated condensing COMBI furnace. 2 appliances in 1. Space saver, game changer and very reliable. the unit will supply 5GPM @ 70F rise DHW and 20-80MBH forced air with a DecStar variable speed blower. You can supply up to a 3-1/2ton B size AC coil and up to 2 stage condenser to give a complete HVAC package. 18x37x37 space saver! video available here; https://www.youtube.com/watch?v=gehnxaiRWl0

Solid_Fuel_Man

If I were a furnace man, it looks like a nice setup. Very impressive numbers!

bob eck

You can put in a condensing Combi Boiler plus duct coil on top of a air handler.
The NTI unit is interesting.
Call NTI ask who the rep is in your area. Also ask NTI if there are any certified trained heating professionals in your area that is installing these units. Get their names and call them.
One draw back is how easy is it to get into the unit and work on the TGWH? Do you have hard water in your area? How hard is it to get in and pump out the TGWH inside the furnaces?

Maddogg08

It is a Navien NPE240A tucked into a small cabinet w/ magnetic blower drive system. Parts for Navien are exactly the same as are the part #s. Connections are external and there is a valve kit for it.( service and mixing). Tons of applications and all the same water issues apply. I have had good luck w/ them.

Patriots51

Would this b considered a hydro air configuration. Or Is the heating side a normal forced air furnace. I understand it has a tankless navien inside the unit for dhw so it is a combi furnace. I've only ever seen Combi boilers. Why wouldn't they go a step further to make it hydro air. isn't it a better way to exchange heat? Sorry for the amateur question. Any explanations are appreciated. 

WhistleFurnace

I live in rural Wisconsin and we had a GF200 installed in 2020, less than five years ago. For well over a year and multiple service calls we put-up with an LP gas smell that first intermittently and then more regularly infiltrated our house. This was recently diagnosed as a defective heat exchanger. True to their word NTI sent a replacement heat exchanger in 2 weeks. Unfortunately that part was defective. We've been waiting a week now for the expedited replacement to arrive. Our combi is still limping along, but when it goes down there's no forced-air heat, no in-floor heat and no hot water. My experience is that this is an expensive, complicated, unreliable piece of equipment that can be difficult to get parts for. In retrospect a redundant heating system with a hot water tank would be my preference.

offdutytech

I have given the GF150 a hard look for my house mainly to test out to see if it was something I wanted to offer to customers. I'm going to install radiant floor on my first floor the hot water tank is coming up for a replacement anyway. I love the concept of the modulating discharge air temp. I have talked to our local rep and they have sold a decent amount with good feed back.

There were a few things I'm not crazy about. The internal expansion tank ease of access should you need to replace it. The sheetmetal configuration for my application I would have need to build a box for it to sit on so the bottom and side returns would provide the correct amount of return air. I'd be hard pressed to fit all that in and tie into the existing supply trunk with the way the ductwork was configured. What happens if you need to replace the boiler down the line? Ultimately I'm probably going with a wall mounted combi and Iflow HVAC air handler. It's just going to fit with my ductwork better for installation. Plus this way I can choose the combi brand I want and piped so change out would be fairly easy.

WhistleFurnace

@offdutytech My HVAC specialist just finished installing a replacement GF200. First he tried to replace the heat exchanger and the new one was defective. Then he tried another heat exchanger and it was defective as well. Then he tried to put my old heat exchange back in, and it no longer worked. After a week without heat or hot water he was able to install the replacement. But not before some rewiring, because it was missing wire harnesses he had to take from the old one. It's a good thing you know how to work on these, because if you have to pay to maintain, it's not cheap.