在加拿大安装费收得太高，维护成本更高，前两年主营TANKLESS的小型公司因为投诉过多，不少都关了
by aclwd (踏雪寻房) at 2011.11.20 22:16 (#7085560@0)
＜本文发表于: 相约加拿大:枫下论坛
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Tankless water heaters are sometimes referred to as instantaneous, which means they heat water only when you need hot water supply. When it comes to tankless gas hot water heaters there are two fuel options: natural gas and propane. It is up to you to make sure there is a sufficient amount of that fuel at your place.
Tankless gas hot water heaters are a onetime investment, as they have life span of about 20 years. It is a sufficient reason to be careful and think over your decisions before buying one.
Read on to learn what advantages and disadvantages tankless gas water heaters have.
Advantages
1.Compact size of tankless gas hot water heaters makes them easy to install, what is more they occupy less space.
2.High efficiency is a typical advantage of tankless gas water heaters. Energy star states that tankless heating systems have energy factor up to .95, while the top efficient tank water heaters have only .67.
3.The temperature of a water flow is constant. In other words, the flow doesn't switch to cooler water, as it happens with tank water heaters, when the tank runs out of hot water. 2 to 5 gallons of hot water per minute are certain to be of the same temperature.
4.As there no reservoir, there is not capacity to be taken into account when using shower. The flow of hot water is continuous and literally endless.
5.Gas tankless water heaters save a lot of energy, especially gas ones do. Each year you can save up to 25% of energy in comparison with storage style water heaters. The reason for such economy is quite self-explicit: tankless gas water heater uses fuel only when hot water is needed.
Disadvantages
1.Tankless gas hot water heaters are, unfortunately, more expensive than conventional one. Average price for a typical unit might reach $700.
2.Upgrading your house to fit tankless gas water heater might be very expensive and demanding process. Sometimes individuals pay up to $3,000 to retrofit their house.
3.Good venting, installation and piping can increase total expenses associated with buying a tankless gas water heater.
4.It takes tankless gas heaters a few seconds to heat the water, which is troublesome for short uses, such as washing of hands. Above all, while waiting for the water flow to get warm, the water is being wasted. As a possible salvation of the problem you can place your tankless water heater closes to the point of use.
5.Might fail to meet temperature requirements, by not heating the water flow to the required temperature in winter. It totally depends on the flow rate of water. Keep in mind that there are models with minimum inlet water temperature requirements.
6.High gas pressure is required to keep tankless gas water heater working effectively. The thing is that in some places gas pressure might be low, that is why you need to check in advance.
7.Maintenance is to be performed once a year according to the manuals and instructions. It is important not to forget about it.
8.In some cases warranty terms can be strict. If you didn't have your tankless gas water heater installed by a licensed plumber there may appear some problems with warranty.
＜本文发表于: 相约加拿大:枫下论坛
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