Viessmann Vitodens 100-W Boiler
Updated: Feb 23, 2019Write a review
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Overview of the Vitodens 100-W
The Viessmann Vitodens 100-W is a gas-fired, wall-mounted condensing boiler. The Vitodens 100-W is Energy Star rated with an efficiency of 94.0% AFUE. It has a stainless steel heat exchanger, and a low-emission modulating stainless steel cylinder burner which is factory calibrated to eliminate field adjustments. The unit has built-in automatic frost protection and multiple venting options with vent length of up to 200 feet. Pipe connections are located at the bottom with serviceable components in the front, allowing for easy installation and maintenance. The Vitodens 100-W is suitable for altitudes of up to 10,000 feet.
Date created: 2019-02-23
Name: Joel Tractenberg
Location: Lakeville, CT
New home construction, installed 4 years ago, nothing but problems ever since. Even with original installer and support from Heat Tech (Viesemanís authorized tech support team in Connecticut.) no one can make this system work properly. It overheats, it underheats, and then sometimes it downright breaks and requires expensive replacement parts. All the boilers have broken completely in the past two months. Very expensive repair bills and heating bills, when it overheats the house. We have radiant heat and forced air so part of the problem may be calibration between the two systems, but after four years you would think it would be dialed in by now, total frustration and Viessmann boilers are at the core of the problem.
Date created: 2019-02-01
Name: Andy W
Location: N. Yarmouth, ME
"Great heat, but intermittent domestic hot water"
I heat a well insulated radiant heat floor but is a complete disappointment when it comes to hot water. It was installed this last fall and has never worked properly. When someone takes a shower or uses one of the faucets, it will stop supplying hot water suddenly. Obviously makes for a very bad experience in the shower. The heater has more than enough capacity for this small apartment. I am not happy at all. My installer has not been able to fix it.
Date created: 2019-01-03
"Sounds like a jet plane"
Installed a Veissman hot water boiler system in Octí18 to replace our original boiler over 50+ years old. The contractor did a great job with the install but it sounds like a jet plane when it starts up! Is this normal? Our old system never sounded like this.
Date created: 2018-12-29
"This is a great replacement for an oil based boiler"
We moved from an oil furnace to a propane furnace. The Viessman 100 was our choice due to the fact we were also installing a propane fueled generator (Generac) This unit is great. It keeps our home warm and also provides hot water. So no need for an electric hot water tank! Highly recommended, quiet, small and efficient!
Date created: 2018-04-28
Costly to maintain shit product! Within 2 years of usage the repair and maintenance cost is equivalent to buying a 2 brand new ones. Viessman crap!
Date created: 2018-04-17
Location: Coastal Maine
"Reports of satisfaction and efficiency greatly exaggerated"
Unit installed in October in under 1500 sq foot, 130 year old home. Promoting this type of unit for this type of dwelling, approaches fraudulent representation. Even if quality installers "should" know, and speak up, if they are sold a bill of goods by a company, and cold is descending hard and fast and there is no heat, then, consumers can't fully blame them - not fully, at least. Never has so much fuel - propane, now - been used in 12 years. There is also the issue of the outside venting, which vents toxins onto such things as plants and side wall shingles. Neither things are good. The fellow who commented that he has these boilers installed on three of his properties? I'd like to hear from his tenants. I don't buy it. As I don't buy other glowing comments. Either they have different units, or properly made units, or their dwellings approach near-laboratory conditions for these boilers, or ? At last, the regional sales rep showed up today. He hit the floor saying that everything looks great, without doing a full check. The boiler generates heat when it wants to. You can't adjust thermostats, and, here, there is one downstairs, and one upstairs, without the unit taking 6 hours to readjust, so, you leave them set. Period. And that's what's been done here. Consumers can do all the research available, but how these units work is so locked in, so computerized, so dependent on having the perfect conditions under which they might work, that they should be avoided unless you dwell in a Viessmann-level laboratory-like environment. An oil burner may have its problems, but if there is any way you can stick with one, I assure you that given age, conditions, etc, of site, you can count on an oil burner, and for far less money. Greater comfort -- and you can even adjust the thermostat and have it respond.
Date created: 2018-01-02
Location: Ontario, Canada
"Mine works great"
Mine has been working well for 5 years now, and has entirely paid for itself in saved electricity costs. It is supplying hot water to an air handler to heat the house, and to a small hot water storage tank for domestic hot water. Right now it needs a replacement gasket, but it is still working and I don't expect it to be expensive.
Date created: 2017-12-20
Name: Richard Williams
Location: Toronto, Canada
"Convinced Viessmann product is a lemon"
We've had a Viessmann vitodens 100 for eight years and every year it has been giving us problems. This year it's constantly registering an f9 fault. My plumbing-heating contractor has been in three times this season, and he has even contacted Viessmann technical support for help even the technical help couldn't figure out what is wrong. I'm convinced we have a lemon. We used to have a Burham boiler for 20 years with never a problem, just maintenance once every year; and I miss it.
Date created: 2017-11-14
"Horrific waste of money."
Five days into installation, replacing an oil-fired boiler. There's the notion that it is the consumer that "doesn't get it." Not the case here. Day five on Vitacon 100 condensing boiler. I hate it. I am cold. Some component is running almost constantly, without any benefit of heat. I have not altered the thermostat temperature. The heat is not dry heat. The unit came with a defect - a missing "wire"? The hot water - flapper? (And there should be a deep manufacturer's discount for that). I would not have switched from an oil-fired boiler to this, if the oil guys had worked harder to find some way of getting a new boiler into the basement, and placement for a new oil tank. (Also they have now lost all business from me that they've had for 11 years). This old house needed the dry heat that the oil furnace supplied. You could tell me that I am imagining that it is now humid (and cold), but I swear I'm not.This took all my savings. The installers, who are "highly qualified" explained nothing about the function of the thermostat, but I asked. If there is an outside sensor to this piece of crap, I'd like to know where it is and if it is working.Sure. The installers will be called back, but what are the chances of any correction. And, if improperly installed, (and I wonder how they could have mounted this thing on a piece of 1 inch plywood sitting on a damp basement floor, and the plywood will rot), there is nothing to do about it. Also, there is the cost of the lease of the propane tanks. The oil tank was "owned." Today, the tanks, delivered with less than 80% full for delivery, were topped off. At a thermostat setting - there are two thermostat's - one upstairs, and one down - of 64 degrees, one person in the house. Electric stove, refrigerator, washer and dryer, I'd like to know how it is that the tanks took 163.1 gallons of propane in under 5 full days.The old oil-fired furnace cracked. But until then, the heating was consistent, efficient like crazy, and provided safe comfort, without those blasted tanks looming outside. Entire savings gone, and cold. And it takes a full 25 seconds for hot water to come out of the kitchen faucet, which is located not 30 feet from the boiler. Either I capture that water in a pan so that I can add hot water to it to use for washing dishes, or I am wasting water. I'm betting the water meter is having a field day. Until now, the water and electric uses had been way below the standards. What a blasted waste of everything. If this is also an installer's failure, just what does anyone think the chances are of them owning it. If there is any way you can avoid replacing your trusty oil-fired furnace, (and the one here also heated water), do it. Take off the side of your house if you have to get a new furnace to fit. PS Why did that woman from Maine give this thing 5 stars when she hates the noise - which I hate, too.
Date created: 2016-11-10
Name: Dave Savage
Location: Ontario, Canada
Do not buy their crap, total waste of money. Demand hot water had to be replaced with electric hot water tank. Furnace had 3 major failures in 4 years. No support from company.
Date created: 2016-02-02
Name: Gerry Marcouix
Location: West Nipissing, Ontario, Canada
Yes , we are a dealer for Viessmann residential and also a customer. I use a Vitoden 100 with a combi plus for my own house. The performance of the boiler is very good. As a dealer rating the manufacturer, tech support are very good; they look after the customer's satisfaction. Parts after sales with 24 hour delivery on most parts, as a dealer that looks after customer satisfaction Veissmann back up their dealer with quality service after sales. For comparison I just call Laars for an igniter for a Mascot LX; delivery is 2- 3 weeks, the unit was built in October 2015. Maybe Laars should look at service after sales.
Date created: 2016-01-06
Name: D. Thomson
Location: Mono, Ontario, Canada
"So far, so good"
Into my third winter with this boiler and it has run flawlessly. It is incredibly quiet and is very efficient. I was particularly impressed by its small size. I have been very pleased with it so far.
Date created: 2015-01-05
Name: P. vanSchalk
"Expensive early life failure"
The combustion fan failed after only a few years' service. The repair cost $1250 Canadian dollars. The blower alone cost $1000.00.
Date created: 2014-11-30
Name: Sue de Nym
Location: Greater Manchester, UK
I had a Viessmann boiler installed 3 years ago. It worked like a dream and we were delighted with the money we saved on our bills until 3 weeks ago, when water started to pour out of the boiler. When the Viessmann engineer came out to it, he identified the faulty hose that had split but refused to fix it under warranty because of the dirty water in the system, saying I needed to get a magnafilter fitted and that my 5 year warranty was now invalid. The boiler had been annually serviced, as per their advice, and nowhere in their literature does it mention the need for a filter. I subsequently found that repairs, when there is dirt in the system, are carried out at the engineer's discretion. I was told twice, by one of Viesmmann's own reps, that if a different engineer had called it would have been repaired and I would have been advised to get the system clean and have a filter installed. After being without hot water or heating for 3 weeks, I had to pay my original installer to come and sort out the problem, which I never thought I would have to do on a boiler installed and serviced by approved and qualified engineers as per the manufacturers instructions. Their so-called customer service agents were disinterested and patronizing, and spoke to me as if I had done something wrong. The product is let down by the shocking after-sales service, which in my case was non-existent. Installing a Viessmann proved to be an expensive and stressful mistake, costing me hundreds of pounds in repairs and hours of telephone calls. My advice would be to avoid them at all costs.
Other Vitodens 100-W Reviews
The Vitodens 100-W is considered an excellent boiler on online forums. A professional on hvac-talk.com states that Viessmann was the first to make a stainless steel heat exchanger and the Vitodens 100-W has the best heat exchanger of any boiler. A comparison between the Vitodens 100-W and a similar Peerless unit on heatinghelp.com found most people choosing the Vitodens 100-W, with many saying that they don't compare and one member stating that it is like comparing a Volkswagen to a Cadillac.
Vitodens 100-W Warranty
The warranty for the Viessman Vitodens 100-W boiler is comprised of the following:
- 2-year warranty on the enclosure, combustion chamber, burner, controls and other parts
- Limited lifetime warranty on the pressure vessel of the boiler. The warranty is prorated after the tenth year
The warranty covers only the original owner at the original site of installation. Labor costs are not included in the warranty.