Posts Tagged ‘Evolution’

Boilers Part 16 – High Efficiency Boiler Disadvantages

November 28, 2010

The Direct Vent Condensing Boiler is the best choice for any home. However, you must be careful when selecting the right boiler for you.

In order to successfully transfer the heat from the flame to the water as easily as possible, the vast majority of condensing boilers force the water through a very restrictive heat exchanger with many small passages. This can cause 2 very serious problems.

The first problem is that if one of these passages becomes blocked with debris or dirt from the system, the heat exchanger will quickly overheat and fail. A heat exchanger replacement on a high efficiency boiler can be in excess of $2,000. It would be a shame to lose all your fuel savings on a major repair like this. These restrictive heat exchangers require extensive cleaning annually. Since many people neglect to call for service, and many contractors don’t even know about this required cleaning, many people have suffered disappointment and heat exchanger failure. Life doesn’t have to be this complicated. If this boiler is installed with the proper flow design, dirt and air separator and cleaned as per the manufacturers’ instructions, it will last a long time.

In my next post, I will discuss the second problem with these restrictive heat exchangers.


Boilers Part 15 – Turndown

November 25, 2010

Hi Again, Turndown is the ability of a boiler to reduce its input to match the load. Imagine a home with 3 floors and a separate thermostat and heating zone for each floor. When all three floors require heat, the demand might be 80,000 BTUH. This would require an 80,000 BTUH boiler. If only the basement needed heat, the load might only be 20,000 BTUH. Firing an 80,000 BTUH boiler would be overkill and horribly inefficient. All DVCB have a turndown that allows the boiler to fire at the required rate for that time so the boiler would fire just at the 20,000BTUH that you need. Efficiency is enhanced once again.

Now that it is crystal clear that the best option for a boiler is the DVCB, Direct Vent Condensing Boiler, I would like to discuss the problems with these boilers and how to avoid them.

Boilers Part 14 – Low Water Temperature Operation

November 23, 2010

Hi Again,

Today I’d like to discuss the advantage of low temperature operation and how it enhances your energy savings. We have discussed in previous posts that most of the time, your radiators will give you enough heat with water temperatures between 90 Deg. F. and 120 Deg. F. If you have in floor radiant heat, your water only needs to be around 90 degrees all the time. In order to extract the most heat from your gas flame and get really high efficiencies, the water entering the boiler must be as low as possible. 90 Deg. F. water will suck so much more heat out of the flame than 140 Deg. F. water. The problem with most boilers is that such low water temperatures will shock the boiler and cause it to crack and leak. Complete destruction!! The DVCB is designed for low water temperature conditions. As a matter of fact, it works best with low water temperatures since it is able to condense and extract so much more heat from your gas dollars. This compounds your savings.

Boilers Part 13 – The Heating Cycle With Outdoor Reset

November 21, 2010

Today I will illustrate the heating cycle with outdoor reset.

Your thermostat is set for 70 deg. F. The temperature drops to 69 degrees and the boiler fires up. Based on the outside temperature of 50 degrees, your boiler reset controller determines that a water temperature of 100 degrees will provide the right amount of heat. The boiler starts heating your water until it reaches 100 degrees. Your home heats up to 70 degrees and the boiler shuts off, but the temperature doesn’t go up higher because your radiators are only 100 degrees. In order to maintain 70 degrees in your home, tha radiators must stay at 100 degrees so they will never cool down. Rather, they will stay at 100 degrees and maintain your exact set point of 70 degrees in your home. How efficient, How comfortable? As it gets colder outside, your boiler will automatically adjust the water in your system hotter and hotter to meet your exact heating needs. Imagine how comfortable it will feel in your home without temperature fluctuations? Imagine how quiet your system will be without the constant noise of your pipes expanding and contracting as they heat up and cool down. But most of all, imagine how much energy you will save due to this operating efficiency.

See this video to learn more about outdoor reset.

Boilers Part 10 – Modulation

November 14, 2010

One of the great operational advantages available with a Mod/Con (Modulating Condensing) boiler is its ability to modulate its heating power to match the requirements of your home. When your boiler is sized, it is designed to provide you with enough heat to keep your home nice and comfortable even on the coldest day of the year. However, most of the time your boiler fires, it is not quite as cold as it was designed for. As a matter of fact, the coldest temperatures only happen less than 3% of the time. All other times, your boiler is too big for your home. When your boiler is too big, it will run in short bursts called “short cycling” and will waste energy. See this video about oversized boilers.

The modulating boiler, however can adjust its heating power to match the actual requirements at the time. This is done in real-time adjusting the boiler’s power depending on weather conditions. Now your boiler is always just the prefect size for your home and is always operating at peak efficiency.

In next post I will discuss the advantage of Reset.

Boilers Part 5 – Direct Vent Condensing Boilers

November 3, 2010

Today we will discuss the best type of boiler for your home. I say the best because it is
1. The Safest
2. The Most Efficient
3. The Most Versatile
4. The Most Compact
5. The boiler that will deliver the greatest comfort.

The Direct Vent Condensing Boiler.

There are so many DVCB’s to choose from so I will dedicate the next posts to the many options, features, pitfalls, and concerns you should be aware of when selecting the right boiler for your home.

Below is a photo of a compact DVCB system that we installed.

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