Laars Mini-Therm Boilers | FurnaceCompare®

Laars Mini-Therm Boiler Overview

The Laars Mini-Therm boiler is a gas-fired residential hydronic boiler series. This series is available in two models, the JVS spark ignition and JVH hot surface ignition with induced draft. Both models can be equipped with natural or propane gas.

The Mini-Therm JVS line offers 85 percent AFUE in six different models with either single or two-stage heating. Energy-saving components of this model include a low/high function that allows homeowners to set the amount of heat disbursed, a built-in draft diverter to retain more air, and automatic vent damper.

Similar to the JVS, the JVH product line is manufactured in six models, but is only available with single-stage heating. This model is equipped with a hot surface ignition system, induced draft system and offers up to 83 percent AFUE.

Both the JVS and JVH product lines feature the Laars copper tube heat exchanger with small cast-iron wet-walls to increase functionality, low-mass heat exchanger and quick heating response.

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Consumer Reviews of Laars Mini-Therm


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #2 of 8 Laars Boiler
  • 45.45% of customers recommended

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Laars Mini-Therm Boiler Reviews

Showing 1-5 of 11 reviews

"Insufficient heating support rep sucks."

2.0 rating
Somewhat Unsatisfied

Insufficient heating, not saying is the boiler might be the plumber / installer talk a good talk so I chose him in the process he recommended 100,000 btu but them he bough a 75,000 btu , I told him to take it back and stick to what you suggested 100,000 any him name is June pernero from Newark so beware, so everything done I'm waiting for winter very light heating coming through so I called him up , good talker say man is a really cold winter so I give in so it went on for couple years I got screwed by this June pernero guy. Early January I decided to install a bathroom on the ground floor, went under the house to run a drain pipe guess what June pernero run heating lines under the house which outside the house so by the time the come back in the house it cool down so heating will poor all the time, spoke to another plumber he said it should be more btu 150,000 btu he said bad job he run return lines inside the heating vents blocking the flow of heat so it must do all over which will cost $8000.00. Ok I call the support service at Laars he don't wanna talk to me because I'm not a plumber very rudely and hang up

Marlon R

Newark, NJ


5.0 rating
Very Satisfied

I am a plumbing heating contractor, I have installed these boilers for years as a low cost option to landlords and homeowners who are on a tight budget. I also have installed these in my own rental properties. The units in my properties have been in for approximately 10 years. Other than the occasional no heat due to a pilot going out because of a bad thermal couple (which happens on all makes and models) they have been incredibly reliable. Not to mention they are very light and the installers enjoy not having to lug in a heavy cast iron unit.

C. Canada

Philadelphia, PA

"Teledyne Laars Boiler model JVT125C"

5.0 rating
Very Satisfied

Well, where to begin. If you consider all I am extremely pleased with the boiler I have installed in my house. The unit was installed in 1986 by a licensed contractor and was supposedly maintained by the local gas supplier for many years. I have been warned by other contractors that the unit was/is not good. I have done the maintenance on the unit for about 12 years and out of curiosity I got the local gas supplier to come in and do the maintenance one year. The technician that came in was supposedly a boiler man as opposed to a ForcedAirGas tech. He took the unit apart, partially, cleaned it somewhat, said he was done and started to put it back together. I escorted him out of my house. I did a better job the first time I cleaned it. I think the problem we all have is newer products, furnaces, boilers, central air conditioners, refrigerators, washers, dryers etc; are all slapped together with parts made by people that don't know or care where the parts are going. They are then assembled by unqualified/uncaring personnel that know there will be no repercussions if the product doesn't perform or even work at all. They don't care. I was considering an nti boiler as a replacement. It was highly recommended by an HVAC man I met and yet the reviews are not good about that product either. He also mentioned that SlantFin boilers were not made well anymore. That is the other product I was/am considering. From my experience SlantFin boilers have been the best for years with very low frequency of repairs and simple maintenance. As you read through some of the "posted" reviews it's either the customer is happy because he has had no problems or the opposite and there have been nothing but problems, service techs don't know how to repair the units because they've never seen the new configurations, they haven't received training. The warranty packages don't cover the items they should because the manufacturer will not stand behind the product because they didn't make it. So if you buy a new unit you have a 50/50 chance of it being a piece of garbage or lasting longer than 5 years without some kind of major breakdown. Then you have to consider the contractor that's doing the install. The installer can make or break the installation. We have a 55 year old refrigerator at my cottage that we keep for beer, it was used when we got it. Since 1995 I've replaced 2 refrigerators at my mother-in-laws house.

B Mason

Toronto, Canada

"Still working after all these years"

4.0 rating
Somewhat Satisfied

This unit came with the house I purchased in 1996. About 10 years ago I serviced it myself by taking it apart and cleaning everything. Now with 20 years of ownership it still works great- no problems with the electronics/ignition, water pump, electric damper, or anything. Just clean the burner tubes every few years (takes 5 minutes) and it keeps running as it should. If it ever fails I'll probably buy a new jvs-100 unit and install it myself.

Paul H

Falls Church, VA

"Poor quality"

1.0 rating
Very Unsatisfied

Very poorly designed product. Nothing but problems. Sucks through gas like crazy. Pilot constantly goes out, and it is hard to access the area to relight it. Had to have it cleaned twice in one year at a cost of $400 each time. Yes it took that much because all of the coils were clogged up with soot. Would not recommend to anyone. There is a reason why it is one of the lowest priced boilers on the market. The old adage applies. You buy cheap you get cheap. Glad I got rid of this thing.


El Paso County, CO

Other Mini-Therm Reviews

Several consumers around the web post negative comments and concerns regarding the Mini-Therm boiler�s performance. Forums such as and have several posts indicating homeowners purchased “lemon” units; these consumers mentions their units have repeatedly broken down over the years.

Frequent errors reported with the Mini-Therm include system lockouts, melted electronic controls and failing rollover switches and other components. Costly repairs and the frequent resurfacing of these troubleshooting issues are common grievances aired by homeowners in other review forums. Contractors attribute some of these problems to poor venting, and others to the unit itself. also rates Laars systems poorly, stating the warranty coverage is not as good as other brands and the components may not be as durable.

LAARS Mini-Therm Model Numbers

The Mini-Therm is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
JVS050ND* 84.4 50000
JVS050PD* 85.4 50000
JVS075ND* 84 75000
JVS075PD* 85.2 75000
JVS100ND* 84 100000
JVS100PD* 85 100000
JVS125ND* 83 125000
JVS125PD* 84.5 125000
JVS160ND* 83 160000
JVS160PD* 84.8 160000
JVS225ND* 83.2 225000
JVS225PD* 85 225000

Mini-Therm Warranty

Laars provides a 1-year limited warranty for all parts. In addition, the integral storage tank is equipped with a 10-year limited warranty and the primary heat exchanger is covered on a pro-rated basis for 20 years after the installation date.

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